[XLA:CPU] Lower to xla.rsqrt for all rsqrt ops. #97371
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Plumb a target_machine through to SupportedVectorTypes and CreateDefinition for rsqrt. Fall back to 1/sqrt(x) if no avx, or f64 without avx512f. PiperOrigin-RevId: 789799524
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[XLA:CPU] Lower to xla.rsqrt for all rsqrt ops.
Plumb a target_machine through to SupportedVectorTypes and CreateDefinition for rsqrt.
Fall back to 1/sqrt(x) if no avx, or f64 without avx512f.