[PATCH] Debug info: Support fragmented variables.

[Adrian Prantl]

  Rebased patch on ToT and addressed review comments. Most importantly this resolves a conflict with r201190, which added DW_OP_piece support for variables occupying only part of a register (essentially the complementary problem).

Hi #llvm,

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

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2680?vs=7011&id=7145#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/IR/DIBuilder.cpp
  lib/IR/DebugInfo.cpp
  lib/Transforms/Scalar/SROA.cpp
  test/DebugInfo/pieces.ll
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