[PATCH] [SROA] Simplify PHI nodes before promoting the alloca

[Jingyue Wu]

Hi chandlerc, nlewycky, eliben, meheff,

Fixes PR20425.

Some PHI users of the alloca are trivially equivalent to the alloca, e.g.,
phi(alloca, alloca). Replace these PHI nodes with the alloca to make promotion
more effective.

http://reviews.llvm.org/D4659

Files:
  lib/Transforms/Scalar/SROA.cpp
  test/Transforms/SROA/phi-and-select.ll
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