[PATCH] [lld][ELF][ARM] Add veneer generation to branch instructions

[Denis Protivensky]

Hi shankar.easwaran, ruiu, wnewton,

When calling ARM code from Thumb and vice versa, a veneer that switches instruction set should be generated.
Added veneer generation for ARM_CALL, ARM_JUMP24 & analogous Thumb instructions.

http://reviews.llvm.org/D7502

Files:
  lib/ReaderWriter/ELF/ARM/ARMRelocationPass.cpp
  test/elf/ARM/rel-arm-jump24-veneer-b.test
  test/elf/ARM/rel-arm-jump24-veneer-bl.test
  test/elf/ARM/rel-thm-jump24-veneer.test

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