[X86] combineSetCCMOVMSK - don't fold MOVMSK(BITCAST(PCMPEQ(X,0))) ->...
[X86] combineSetCCMOVMSK - don't fold MOVMSK(BITCAST(PCMPEQ(X,0))) -> PTESTZ(X,X) if we're not testing every element comparison
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[X86] combineSetCCMOVMSK - don't fold MOVMSK(BITCAST(PCMPEQ(X,0))) -> PTESTZ(X,X) if we're not testing every element comparison