Changeset 11058:38121b8b2462
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x86: implement rcpps and rcpss SSE insts

These are packed single-precision approximate reciprocal operations,
vector and scalar versions, respectively.

This code was basically developed by copying the code for
sqrtps and sqrtss.  The mrcp micro-op was simplified relative to
msqrt since there are no double-precision versions of this operation.