[PATCH] Add MCSymbolizer for disassembled instruction symbolization/annotation.

[Ahmed Bougacha]

  Add missing check for unknown VariantKinds translating to null MCExprs.

Hi qcolombet, grosbach,

http://llvm-reviews.chandlerc.com/D801

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D801?vs=2058&id=2110#toc

Files:
  include/llvm/MC/MCDisassembler.h
  include/llvm/MC/MCExternalSymbolizer.h
  include/llvm/MC/MCObjectSymbolizer.h
  include/llvm/MC/MCRelocationInfo.h
  include/llvm/MC/MCSymbolizer.h
  include/llvm/Support/TargetRegistry.h
  lib/MC/CMakeLists.txt
  lib/MC/MCDisassembler.cpp
  lib/MC/MCDisassembler/Disassembler.cpp
  lib/MC/MCExternalSymbolizer.cpp
  lib/MC/MCObjectSymbolizer.cpp
  lib/MC/MCRelocationInfo.cpp
  lib/MC/MCSymbolizer.cpp
  lib/Target/ARM/Disassembler/ARMDisassembler.cpp
  lib/Target/ARM/MCTargetDesc/ARMMCTargetDesc.cpp
  lib/Target/ARM/MCTargetDesc/ARMMCTargetDesc.h
  lib/Target/ARM/MCTargetDesc/ARMMachORelocationInfo.cpp
  lib/Target/ARM/MCTargetDesc/CMakeLists.txt
  lib/Target/X86/Disassembler/X86Disassembler.cpp
  lib/Target/X86/MCTargetDesc/CMakeLists.txt
  lib/Target/X86/MCTargetDesc/X86ELFRelocationInfo.cpp
  lib/Target/X86/MCTargetDesc/X86MCTargetDesc.cpp
  lib/Target/X86/MCTargetDesc/X86MCTargetDesc.h
  lib/Target/X86/MCTargetDesc/X86MachORelocationInfo.cpp
  test/Object/X86/objdump-disassembly-symbolic.test
  tools/llvm-objdump/llvm-objdump.cpp
  tools/llvm-objdump/llvm-objdump.h
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