[PATCH] add the -mrecip driver flag and process its options

[Sanjay Patel]

Forgot to mention: as noted in the LLVM patch, this is a superset of gcc's PowerPC and x86 options and then some. We can handle float/double, scalar/vector, and div/sqrt independently and also specify the number of refinement steps per operation type.


http://reviews.llvm.org/D8989

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