[ROCDL] added: rsq to rocdl.math; fixes to global/flat prefetch (#176167) PR adds rsq to rocdl.math as well as a fix to global/flat prefetch - Note, prefetch ops must have MemWrite trait. Otherwise, they are removed by any DCE pass in a pipeline. GitOrigin-RevId: 9b6bf8f91c4741fbc069f5811405810cb107afb0
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