[AArch64] Correctly detect X reg from W reg in isCopyImpl (#137348) The MachineCopyPropagation pass was incorrectly removing copy (ORRWrs) instruction that appeared to be a nop. The instruction should not have been marked as a copy though, the code was incorrectly assuming that w29 - w0 + x0 == x29, but as x29 is fp it was out of order with the other registers. Fixes an issue reported on #129889.
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