[PATCH] Optimize square root squared (PR21126)

[Sanjay Patel]

Hi hfinkel, majnemer, dexonsmith,

When unsafe-fp-math is enabled, we can turn sqrt(X) * sqrt(X) into X. 

This can happen in the real world when calculating x ** 3/2. This occurs in test-suite/SingleSource/Benchmarks/BenchmarkGame/n-body.c.

http://reviews.llvm.org/D5584

Files:
  lib/Transforms/InstCombine/InstCombineMulDivRem.cpp
  test/Transforms/InstCombine/fmul.ll
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