[PATCH] Handle sqrt() shrinking in SimplifyLibCalls like any other call

[Sanjay Patel]

Hi hfinkel, beanz,

This patch removes a chunk of special case logic for folding sqrt() -> sqrtf() in InstCombineCasts and handles it in the mainstream path of SimplifyLibCalls. 

No functional change intended, but I loosened the restriction on the existing sqrt testcases to allow for this optimization even without unsafe-fp-math because that's the existing behavior.

I also added a missing test case for not shrinking the llvm.sqrt.f64 intrinsic in case the result is used as a double.

http://reviews.llvm.org/D5919

Files:
  lib/Transforms/InstCombine/InstCombineCasts.cpp
  lib/Transforms/Utils/SimplifyLibCalls.cpp
  test/Transforms/InstCombine/double-float-shrink-1.ll
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