[PATCH] Use an 'l' prefix when an 'L' prefix would produce an invalid MachO

[Rafael Ávila de Espíndola]

  Includes Lang Hames' suggestion and more testing.

Hi grosbach,

http://llvm-reviews.chandlerc.com/D2727

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2727?vs=6958&id=6991#toc

Files:
  include/llvm/CodeGen/AsmPrinter.h
  include/llvm/CodeGen/TargetLoweringObjectFileImpl.h
  include/llvm/IR/Mangler.h
  include/llvm/Target/TargetLowering.h
  include/llvm/Target/TargetLoweringObjectFile.h
  lib/CodeGen/AsmPrinter/AsmPrinter.cpp
  lib/CodeGen/AsmPrinter/AsmPrinterDwarf.cpp
  lib/CodeGen/AsmPrinter/DwarfCFIException.cpp
  lib/CodeGen/AsmPrinter/Win64Exception.cpp
  lib/CodeGen/TargetLoweringBase.cpp
  lib/CodeGen/TargetLoweringObjectFileImpl.cpp
  lib/ExecutionEngine/MCJIT/MCJIT.cpp
  lib/IR/Mangler.cpp
  lib/LTO/LTOCodeGenerator.cpp
  lib/LTO/LTOModule.cpp
  lib/Target/ARM/ARMTargetObjectFile.cpp
  lib/Target/ARM/ARMTargetObjectFile.h
  lib/Target/PowerPC/PPCMCInstLower.cpp
  lib/Target/Sparc/SparcTargetObjectFile.cpp
  lib/Target/Sparc/SparcTargetObjectFile.h
  lib/Target/TargetLoweringObjectFile.cpp
  lib/Target/X86/X86MCInstLower.cpp
  lib/Target/X86/X86TargetObjectFile.cpp
  lib/Target/X86/X86TargetObjectFile.h
  lib/Target/XCore/XCoreTargetObjectFile.cpp
  test/CodeGen/PowerPC/osx-private-labels.ll
  test/CodeGen/PowerPC/private.ll
  test/CodeGen/X86/2009-11-16-UnfoldMemOpBug.ll
  test/CodeGen/X86/pr10420.ll
  test/CodeGen/X86/private-2.ll
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