[PATCH] GVN: propagate fcmp equalities (PR17713)

[Sanjay Patel]

Added test cases for other FP comparisons. Tests based on existing integer tests.
Minimized IR: "2.00000+00" --> "2.0".


http://reviews.llvm.org/D6911

Files:
  lib/Transforms/Scalar/GVN.cpp
  test/Transforms/GVN/condprop.ll
  test/Transforms/GVN/edge.ll

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