AMDGPU: Avoid introducing unnecessary fabs in fast fdiv lowering (#172553) If the sign bit of the denominator is known 0, do not emit the fabs. Also, extend this to handle min/max with fabs inputs. I originally tried to do this as the general combine on fabs, but it proved to be too much trouble at this time. This is mostly complexity introduced by expanding the various min/maxes into canonicalizes, and then not being able to assume the sign bit of canonicalize (fabs x) without nnan. This defends against future code size regressions in the atan2 and atan2pi library functions.
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