rs6000: lxsdux / stxsdux do not exist
Our md files refer to {l,st}xsd%U<n>x, but no {l,st}xsdux insns exist. This patch removes the update forms. All these use constraint "Z" which does not allow update form, so there is no practical difference. * config/rs6000/rs6000.md (*mov<mode>_hardfloat32): Remove %U from the lxsdx and stxsdx alternatives. (*mov<mode>_hardfloat64): Ditto. * config/rs6000/vsx.md (*vsx_extract_<mode>_store): Ditto. From-SVN: r264064
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