[PATCH] Debug info: Teach the SDag type legalizer how to split up debug info for integer values that are split into a hi and lo part.

[Adrian Prantl]

Thanks for the feedback, this is a all-around simplified revision of the previous patch! Particularly, I
- got rid of (now) redundant code in InstrEmitter.
- got rid of the second testcase, which could be reduced to the first without loss of generality.
- simplified the first testcase

http://reviews.llvm.org/D4832

Files:
  lib/CodeGen/SelectionDAG/LegalizeTypes.cpp
  lib/CodeGen/SelectionDAG/SelectionDAG.cpp
  test/DebugInfo/X86/sdagsplit-1.ll
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