[PATCH] MergeFuncs should handle dynamic GEPs

[Pete Cooper]

When compiling std::vector<float> and std::vector<int>, both get a function called push_back_slow_path.  This function could be merged except that one does float[i] and the other int[i].  These are identical given that int and float have the same size and alignment.

This patch teaches MergeFunctions about dynamic GEPs, which must return the same offset given 'index * element size' for both LHS and RHS.

This reduces the size of an LTO'd llc by almost 1.5%.

http://reviews.llvm.org/D7170

Files:
  lib/Transforms/IPO/MergeFunctions.cpp
  test/Transforms/MergeFunc/gep.ll
  test/Transforms/MergeFunc/gep2.ll

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