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pic patch for arm-elf

This patch implements GC for GOT and PLT relocs in the elf32-arm
backend.  One effect of this is to avoid a spurious R_ARM_NONE reloc
which was blighting glibc by causing libc.so to be marked as
DT_TEXTREL.  

It also replaces the code sequence used for PLT thunks with a more
efficient version, which can make a significant difference on some
processors.

May I check this in?

Thanks

p.

Attachment: elf.diff
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