[PATCH] Debug info: Support fragmented variables.

[Adrian Prantl]

Rebased on today's trunk. Otherwise mostly unchanged so far, I have a couple of questions regarding Chandler's comments that I'd like to clarify before the next iteration.
Thanks for all the feedback so far!

http://reviews.llvm.org/D2680

Files:
  include/llvm/CodeGen/SelectionDAG.h
  include/llvm/IR/DebugInfo.h
  lib/CodeGen/AsmPrinter/DwarfDebug.cpp
  lib/CodeGen/SelectionDAG/InstrEmitter.cpp
  lib/CodeGen/SelectionDAG/LegalizeTypes.cpp
  lib/CodeGen/SelectionDAG/SelectionDAG.cpp
  lib/IR/DebugInfo.cpp
  lib/Transforms/Scalar/SROA.cpp
  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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