[PATCH] [SROA] Fold a PHI node if all its incoming values are the same

[Jingyue Wu]

Thanks for the review, Chandler. 

I see what you are saying. I agree the current dead-operand-trackign mechanism is a little cumbersome for the use of SimplifyInstruction. 

I reverted the use of SimplifyInstruction and left the architectural changes as TODO. PTAL.

http://reviews.llvm.org/D4659

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