[X86] Remove single-use checks when combining xor and vfmulc/vcfmulc. (#128910) The current implementation to combine xor patterns for conjugation with complex multiplies will not perform the transformation when either the conjugate xor result or other multiplicand have other uses. This change eliminates both single-use checks. The transformation will eliminate the xor dependence and hence should be profitable even if the conjugate is used elsewhere - and more profitable if the xor is used in multiple fmulc/fcmulc instructions, eventually going dead. The check of the other multiplicand isn't required for correctness and has no apparent performance implications.
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