[PATCH] add support for LayoutAfter/LayoutBefore references

[Shankar Kalpathi Easwaran]

  Updated code to reflect review comments.

Hi Bigcheese, kledzik,

http://llvm-reviews.chandlerc.com/D373

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D373?vs=895&id=912#toc

Files:
  test/section-position.objtxt
  test/layoutafter-test.objtxt
  test/layoutbefore-test.objtxt
  test/elf/rodata.objtxt
  test/elf/sections.objtxt
  test/elf/phdr.objtxt
  tools/lld-core/lld-core.cpp
  tools/lld-core/TestingHelpers.hpp
  include/lld/ReaderWriter/ELFTargetInfo.h
  include/lld/Core/Reference.h
  include/lld/Core/Pass.h
  include/lld/Passes/Passes.h
  include/lld/Passes/LayoutPass.h
  lib/ReaderWriter/ELF/PPC/PPCTargetHandler.cpp
  lib/ReaderWriter/ELF/X86/X86TargetHandler.cpp
  lib/ReaderWriter/ELF/Hexagon/HexagonRelocationHandler.cpp
  lib/ReaderWriter/ELF/X86_64/X86_64TargetHandler.cpp
  lib/ReaderWriter/ELF/File.h
  lib/ReaderWriter/ELF/Atoms.h
  lib/ReaderWriter/ELF/ELFTargetInfo.cpp
  lib/ReaderWriter/ELF/CMakeLists.txt
  lib/ReaderWriter/MachO/MachOTargetInfo.cpp
  lib/Passes/OrderPass.cpp
  lib/Passes/LayoutPass.cpp
  lib/Passes/CMakeLists.txt
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