[PATCH] [SimplifyLibCalls] Enable double to float shrinking for copysign

[Matthias Braun]

Allow double to float shrinking when ConstantFPs are involved.
For example this will turn float x; fmin(1.0, (double)x); into fminf(1.0f, x);

http://reviews.llvm.org/D6495

Files:
  lib/Transforms/Utils/SimplifyLibCalls.cpp
  test/Transforms/InstCombine/float-shrink-compare.ll
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