[PATCH] Debug info: Support fragmented variables.

[Adrian Prantl]

  Updated to also support variables split up by SelectionDAG’s integer type legalization. Thanks iains for providing additional testcases.

Hi #llvm,

http://llvm-reviews.chandlerc.com/D2680

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2680?vs=7145&id=7324#toc

Files:
  docs/SourceLevelDebugging.rst
  include/llvm/CodeGen/AsmPrinter.h
  include/llvm/CodeGen/MachineInstr.h
  include/llvm/DIBuilder.h
  include/llvm/DebugInfo.h
  lib/CodeGen/AsmPrinter/AsmPrinter.cpp
  lib/CodeGen/AsmPrinter/DwarfDebug.cpp
  lib/CodeGen/AsmPrinter/DwarfUnit.cpp
  lib/CodeGen/SelectionDAG/InstrEmitter.cpp
  lib/CodeGen/SelectionDAG/LegalizeTypes.cpp
  lib/CodeGen/SelectionDAG/SelectionDAG.cpp
  lib/IR/DIBuilder.cpp
  lib/IR/DebugInfo.cpp
  lib/Support/GraphWriter.cpp
  lib/Transforms/Scalar/SROA.cpp
  test/DebugInfo/X86/pieces-1.ll
  test/DebugInfo/X86/pieces-2.ll
  test/DebugInfo/X86/pieces-3.ll
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