[binutils-gdb] PPC64: Allow .TOC. in linker script to override backend calculated value

[sergiodj+buildbot at redhat dot com]

*** TEST RESULTS FOR COMMIT 43417696fe32416607940258ded622c121872515 ***

Author: Alan Modra <amodra@gmail.com>
Branch: master
Commit: 43417696fe32416607940258ded622c121872515

PPC64: Allow .TOC. in linker script to override backend calculated value

bfd/
	* elf64-ppc.c (ppc64_elf_func_desc_adjust): Don't redefine .TOC.
	if already defined, and set linker_def.
	(ppc64_elf_set_toc): Use .TOC. value if defined other than by
	the backend.
ld/
	* ldexp.c (exp_fold_tree_1): Clear linker_def on symbol assignment.