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

[Jingyue Wu]

Chandler, thanks for your suggestions! I think moving the logic to SliceBuilder makes perfect sense. 

After modifying SliceBuilder::visitPHINode, I found it almost the same as visitSelectInst. Therefore, I also refactored the code to merge visitPHINode and visitSelectInst to one function. Let me know if it looks good to you.

http://reviews.llvm.org/D4659

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