[X86] combineSetCCMOVMSK - fold PTEST(XOR(X,Y),XOR(X,Y)) instead of PTEST(SUB(X,Y),SUB(X,Y))
Consistently use the PTEST(XOR(X,Y),XOR(X,Y)) pattern for all-vector comparisons
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Consistently use the PTEST(XOR(X,Y),XOR(X,Y)) pattern for all-vector comparisons