Chris Lattner 77d00b0cea many cleanups to the pow optimizer. Allow it to handle powf,
add support for  pow(x, 2.0) -> x*x.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49411 91177308-0d34-0410-b5e6-96231b3b80d8
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