[PATCH] [x86] make reciprocal estimate code generation more flexible

[hfinkel at anl.gov]

Whether or not we're allowed to use estimates for operations that are normally required to be exact, div and sqrt, are not really target features. They're much closer, conceptually, to UnsafeFPMath and friends. Plus, we need these same options for other backends (PowerPC, for example). I'd like to see flags for these added to include/llvm/Target/TargetOptions.h (along with UnsafeFPMath) so that we can handle them in a uniform way.


http://reviews.llvm.org/D8982

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