[PATCH] [lld][ELF][ARM] Generate PLT entries for function calls from ARM and Thumb code

[Denis Protivensky]

Hi shankarke, ruiu,

The function call that goes through PLT table may be performed from both ARM and Thumb code. This situation requires adding a veneer to original PLT code (which is always ARM) to effect Thumb-to-ARM transition.

http://reviews.llvm.org/D8701

Files:
  lib/ReaderWriter/ELF/ARM/ARMRelocationPass.cpp
  test/elf/ARM/plt-interwork.test
  test/elf/ARM/rel-ifunc.test

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