[PATCH] Rename determineInsertionPoints to determinePHINodes, expose it so it can be reused

[Daniel Berlin]

Hi qcolombet, chandlerc,

MemorySSA uses this algorithm. This moves the code around and changes the arguments so it can be reused in both places.
We don't have an SSAUtils.h or anything, but happy to put this wherever.

There are no actual algorithm or datastructure changes in here, just code movement.

http://reviews.llvm.org/D9118

Files:
  include/llvm/Transforms/Utils/PromoteMemToReg.h
  lib/Transforms/Utils/PromoteMemoryToRegister.cpp

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