[PATCH] Debug info: Support fragmented variables.

[Adrian Prantl]

Rebased on todays trunk.

This patch teaches SROA to split the debug info for aggregate variables into pieces describing the individual scalar elements of the former aggregate.

Chandler, could you please review my responses to you previous review?

http://reviews.llvm.org/D2680

Files:
  lib/Transforms/Scalar/SROA.cpp
  test/DebugInfo/X86/sroasplit-1.ll
  test/DebugInfo/X86/sroasplit-2.ll
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