[PATCH] SROA: Defer migrating the debug info for new allocas until after all partitions are created.

[Adrian Prantl]

When compiling really large programs the pointer values in the DbgDeclares map may actually get recycled.

- clear the pointer map when entering a function
- remove values after the dbg.declare has been deleted

tested via an assertion.


http://reviews.llvm.org/D6766

Files:
  lib/Transforms/Scalar/SROA.cpp
  test/DebugInfo/X86/array2.ll
  test/DebugInfo/X86/sroasplit-1.ll
  test/DebugInfo/X86/sroasplit-2.ll
  test/DebugInfo/X86/sroasplit-3.ll

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