[PATCH] ARM: generation of .ARM.exidx/.ARM.extab sections

[Leny Kholodov]

Hi ruiu, shankar.easwaran, Bigcheese, denis-protivensky,

This patch provides generation of .ARM.exidx & .ARM.extab sections which are used for unwinding. The patch adds new content type typeARMExidx for atoms from .ARM.exidx section and integration of atoms with such type to the ELF ReaderWriter. Most of changes were done for only ARM component. However, some changes have to be implemented in common headers.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D9324

Files:
  include/lld/Core/DefinedAtom.h
  lib/Core/DefinedAtom.cpp
  lib/ReaderWriter/ELF/ARM/ARMELFFile.h
  lib/ReaderWriter/ELF/ARM/ARMExecutableWriter.h
  lib/ReaderWriter/ELF/ARM/ARMSymbolTable.h
  lib/ReaderWriter/ELF/ARM/ARMTargetHandler.h
  lib/ReaderWriter/ELF/Atoms.h
  lib/ReaderWriter/ELF/TargetLayout.h
  test/elf/ARM/exidx.test

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