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[committed] MIPS16/GAS: Relax 32-bit non-PIC PC-relative synthetic instructions

Implement the relaxation of MIPS16 PC-relative synthetic LA, DLA, LW and 
LD instructions to an equivalent sequence of instructions produced where 
the address operand requested is out of range, absolute or requires 
linker relocation, for ABIs that use 32-bit addressing and non-PIC code.

The sequence generated uses the register specified for the destination 
operand as a temporary and begins with LI to load the high 16-bit part 
of the address, then continues with SLL by 16 bits to move that part 
into place and finally completes with a suitable operation corresponding 
to the synthetic instruction used, one of: 2-argument ADDIU, 2-argument 
DADDIU, absolute LW, and absolute LD respectively, providing the low 
16-bit part of the address.  All instructions use the extended encoding.  
As a special exception accept absolute addresses for relaxation even in 
PIC code.

For example:

	la	$2, 0x12345678

produces code as:

	li	$2, 0x1234
	sll	$2, $2, 16
	addiu	$2, 0x5678


Where linker relocation is required emit an R_MIPS16_HI16 relocation on 
the initial LI instruction and an R_MIPS16_LO16 relocation on the final

For example (where `foo' is not local):

	lw	$3, foo

produces code as:

	li	$3, %hi(foo)
	sll	$3, $3, 16
	lw	$3, %lo(foo)($3)


Emit assembly warnings as appropriate where this new relaxation triggers 
in the `nomacro' mode or for an instruction manually placed in a branch 
delay slot in the `noreorder' mode.  Refrain from relaxation where an 
explicit instruction size suffix has been used and in the `noautoextend' 

	* config/tc-mips.c (RELAX_MIPS16_ENCODE): Add `pic', `sym32' and 
	`nomacro' flags.
	New macros.
	(RELAX_MIPS16_CLEAR_MACRO): New macros.
	(append_insn): Pass `mips_pic', HAVE_32BIT_SYMBOLS and
	`mips_opts.warn_about_macros' settings to RELAX_MIPS16_ENCODE.
	(mips16_macro_frag): New function.
	(md_estimate_size_before_relax): Handle HI16/LO16 relaxation.
	(mips_relax_frag): Likewise.
	(md_convert_frag): Likewise.

	* testsuite/gas/mips/mips16@relax-swap3.d: Remove error output, 
	add dump patterns.
	* testsuite/gas/mips/mips16e@relax-swap3.d: New test 
	* testsuite/gas/mips/micromips@relax-swap3.d: Remove trailing 
	NOP padding.
	* testsuite/gas/mips/mips16-pcrel-reloc-2.d: Remove error 
	output, add dump patterns.
	* testsuite/gas/mips/mips16-pcrel-reloc-3.d: Remove error 
	output, add dump patterns.
	* testsuite/gas/mips/mips16-pcrel-reloc-6.d: Remove error 
	output, add dump patterns.
	* testsuite/gas/mips/mips16-pcrel-reloc-7.d: Remove error 
	output, add dump patterns.
	* testsuite/gas/mips/mips16-pcrel-addend-2.d: Remove error 
	output, add dump patterns.
	* testsuite/gas/mips/mips16-pcrel-addend-3.d: Remove error 
	output, add dump patterns.
	* testsuite/gas/mips/mips16-pcrel-absolute.d: Remove error 
	output, add dump patterns.
	* testsuite/gas/mips/mips16-pcrel-absolute-1.d: Remove error 
	output, add dump patterns.
	* testsuite/gas/mips/mips16@relax-swap3.l: Remove file.
	* testsuite/gas/mips/mips16-pcrel-reloc-2.l: Remove file.
	* testsuite/gas/mips/mips16-pcrel-reloc-3.l: Remove file.
	* testsuite/gas/mips/mips16-pcrel-reloc-6.l: Remove file.
	* testsuite/gas/mips/mips16-pcrel-reloc-7.l: Remove file.
	* testsuite/gas/mips/mips16-pcrel-addend-2.l: Remove file.
	* testsuite/gas/mips/mips16-pcrel-addend-3.l: Remove file.
	* testsuite/gas/mips/mips16-pcrel-absolute.l: Remove file.
	* testsuite/gas/mips/mips16-pcrel-absolute-1.l: Remove file.
	* testsuite/gas/mips/relax-swap3.s: Adjust trailing padding.

	* testsuite/gas/mips/mips16-pcrel-0.d: New test.
	* testsuite/gas/mips/mips16-pcrel-1.d: New test.
	* testsuite/gas/mips/mips16-pcrel-2.d: New test.
	* testsuite/gas/mips/mips16-pcrel-3.d: New test.
	* testsuite/gas/mips/mips16-pcrel-4.d: New test.
	* testsuite/gas/mips/mips16-pcrel-5.d: New test.
	* testsuite/gas/mips/mips16-pcrel-pic-0.d: New test.
	* testsuite/gas/mips/mips16-pcrel-pic-1.d: New test.
	* testsuite/gas/mips/mips16-pcrel-n32-0.d: New test.
	* testsuite/gas/mips/mips16-pcrel-n32-1.d: New test.
	* testsuite/gas/mips/mips16-pcrel-n64-sym32-0.d: New test.
	* testsuite/gas/mips/mips16-pcrel-n64-sym32-1.d: New test.
	* testsuite/gas/mips/mips16-pcrel-n64-0.d: New test.
	* testsuite/gas/mips/mips16-pcrel-n64-1.d: New test.
	* testsuite/gas/mips/mips16-pcrel-delay-0.d: New test.
	* testsuite/gas/mips/mips16-pcrel-delay-1.d: New test.
	* testsuite/gas/mips/mips16-pcrel-addend-4.d: New test.
	* testsuite/gas/mips/mips16-pcrel-addend-5.d: New test.
	* testsuite/gas/mips/mips16-pcrel-addend-6.d: New test.
	* testsuite/gas/mips/mips16-pcrel-addend-7.d: New test.
	* testsuite/gas/mips/mips16-pcrel-addend-8.d: New test.
	* testsuite/gas/mips/mips16-pcrel-addend-9.d: New test.
	* testsuite/gas/mips/mips16-pcrel-addend-pic-8.d: New test.
	* testsuite/gas/mips/mips16-pcrel-addend-pic-9.d: New test.
	* testsuite/gas/mips/mips16-pcrel-addend-n32-8.d: New test.
	* testsuite/gas/mips/mips16-pcrel-addend-n32-9.d: New test.
	* testsuite/gas/mips/mips16-pcrel-addend-n64-sym32-8.d: New test.
	* testsuite/gas/mips/mips16-pcrel-addend-n64-sym32-9.d: New test.
	* testsuite/gas/mips/mips16-pcrel-addend-n64-8.d: New test.
	* testsuite/gas/mips/mips16-pcrel-addend-n64-9.d: New test.
	* testsuite/gas/mips/mips16-pcrel-absolute-2.d: New test.
	* testsuite/gas/mips/mips16-pcrel-absolute-3.d: New test.
	* testsuite/gas/mips/mips16-pcrel-absolute-4.d: New test.
	* testsuite/gas/mips/mips16-pcrel-absolute-5.d: New test.
	* testsuite/gas/mips/mips16-pcrel-absolute-6.d: New test.
	* testsuite/gas/mips/mips16-pcrel-absolute-7.d: New test.
	* testsuite/gas/mips/mips16-pcrel-absolute-pic-4.d: New test.
	* testsuite/gas/mips/mips16-pcrel-absolute-pic-6.d: New test.
	* testsuite/gas/mips/mips16-pcrel-absolute-n32-4.d: New test.
	* testsuite/gas/mips/mips16-pcrel-absolute-n32-6.d: New test.
	* testsuite/gas/mips/mips16-pcrel-absolute-n64-4.d: New test.
	* testsuite/gas/mips/mips16-pcrel-absolute-n64-6.d: New test.
	* testsuite/gas/mips/mips16-pcrel-absolute-n64-sym32-4.d: New 
	* testsuite/gas/mips/mips16-pcrel-absolute-n64-sym32-6.d: New 
	* testsuite/gas/mips/mips16-pcrel-absolute-pic-n32-4.d: New 
	* testsuite/gas/mips/mips16-pcrel-absolute-pic-n32-6.d: New 
	* testsuite/gas/mips/mips16-pcrel-absolute-pic-n64-4.d: New 
	* testsuite/gas/mips/mips16-pcrel-absolute-pic-n64-6.d: New 
	* testsuite/gas/mips/mips16-pcrel-absolute-pic-n64-sym32-4.d: 
	New test.
	* testsuite/gas/mips/mips16-pcrel-absolute-pic-n64-sym32-6.d: 
	New test.
	* testsuite/gas/mips/mips16-pcrel-0.l: New stderr output.
	* testsuite/gas/mips/mips16-pcrel-1.l: New stderr output.
	* testsuite/gas/mips/mips16-pcrel-2.l: New stderr output.
	* testsuite/gas/mips/mips16-pcrel-3.l: New stderr output.
	* testsuite/gas/mips/mips16-pcrel-4.l: New stderr output.
	* testsuite/gas/mips/mips16-pcrel-5.l: New stderr output.
	* testsuite/gas/mips/mips16-pcrel-delay-0.l: New stderr output.
	* testsuite/gas/mips/mips16-pcrel-delay-1.l: New stderr output.
	* testsuite/gas/mips/mips16-pcrel-addend-8.l: New stderr output.
	* testsuite/gas/mips/mips16-pcrel-addend-9.l: New stderr output.
	* testsuite/gas/mips/mips16-pcrel-absolute-4.l: New stderr 
	* testsuite/gas/mips/mips16-pcrel-absolute-6.l: New stderr 
	* testsuite/gas/mips/mips16-pcrel-0.s: New test source.
	* testsuite/gas/mips/mips16-pcrel-1.s: New test source.
	* testsuite/gas/mips/mips16-pcrel-2.s: New test source.
	* testsuite/gas/mips/mips16-pcrel-3.s: New test source.
	* testsuite/gas/mips/mips16-pcrel-4.s: New test source.
	* testsuite/gas/mips/mips16-pcrel-5.s: New test source.
	* testsuite/gas/mips/mips16-pcrel-delay-0.s: New test source.
	* testsuite/gas/mips/mips16-pcrel-delay-1.s: New test source.
	* testsuite/gas/mips/mips16-pcrel-addend-4.s: New test source.
	* testsuite/gas/mips/mips16-pcrel-addend-5.s: New test source.
	* testsuite/gas/mips/mips16-pcrel-addend-6.s: New test source.
	* testsuite/gas/mips/mips16-pcrel-addend-7.s: New test source.
	* testsuite/gas/mips/mips16-pcrel-addend-8.s: New test source.
	* testsuite/gas/mips/mips16-pcrel-addend-9.s: New test source.
	* testsuite/gas/mips/mips16-pcrel-absolute-2.s: New test.
	* testsuite/gas/mips/mips16-pcrel-absolute-3.s: New test.
	* testsuite/gas/mips/mips16-pcrel-absolute-4.s: New test.
	* testsuite/gas/mips/mips16-pcrel-absolute-5.s: New test.
	* testsuite/gas/mips/mips16-pcrel-absolute-6.s: New test.
	* testsuite/gas/mips/mips16-pcrel-absolute-7.s: New test.
	* testsuite/gas/mips/mips.exp: Run the new tests.

	* testsuite/ld-mips-elf/mips16-pcrel-0.d: New test.
	* testsuite/ld-mips-elf/mips16-pcrel-1.d: New test.
	* testsuite/ld-mips-elf/mips16-pcrel-addend-2.d: New test.
	* testsuite/ld-mips-elf/mips16-pcrel-addend-6.d: New test.
	* testsuite/ld-mips-elf/mips16-pcrel-n32-0.d: New test.
	* testsuite/ld-mips-elf/mips16-pcrel-n32-1.d: New test.
	* testsuite/ld-mips-elf/mips16-pcrel-n64-sym32-0.d: New test.
	* testsuite/ld-mips-elf/mips16-pcrel-n64-sym32-1.d: New test.
	* testsuite/ld-mips-elf/mips-elf.exp: Run the new tests.
[Patch attached compressed due to its size.]

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