[PATCH] Debug info: Support fragmented variables.

[Adrian Prantl]

  Rebased on r204198.
  Moved the DWARF expression output for DW_op_pieces out of emitDebugLocEntry::emitDebugLocEntry() and into a DWARFPieceEmitter. Should be more readable this way.

Hi #llvm,

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

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2680?vs=7650&id=7931#toc

Files:
  docs/SourceLevelDebugging.rst
  include/llvm/CodeGen/AsmPrinter.h
  include/llvm/CodeGen/MachineInstr.h
  include/llvm/CodeGen/SelectionDAG.h
  include/llvm/IR/DIBuilder.h
  include/llvm/IR/DebugInfo.h
  lib/CodeGen/AsmPrinter/AsmPrinterDwarf.cpp
  lib/CodeGen/AsmPrinter/DwarfDebug.cpp
  lib/CodeGen/AsmPrinter/DwarfDebug.h
  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/Transforms/Scalar/SROA.cpp
  test/DebugInfo/X86/dbg-large-unsigned-const.ll
  test/DebugInfo/X86/pieces-1.ll
  test/DebugInfo/X86/sdagsplit-1.ll
  test/DebugInfo/X86/sdagsplit-2.ll
  test/DebugInfo/X86/sroasplit-1.ll
  test/DebugInfo/X86/sroasplit-2.ll
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