[PATCH] [SimplifyLibCalls] Improve double->float shrinking to consider constants

[Matthias Braun]

This allows cases like float x; fmin(1.0, x); to be optimized to fminf(1.0f, x);

http://reviews.llvm.org/D6496

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