[X86] Add test case for SetCCMOVMSK combine.
Create 2 users for MOVMSK to test if compiler would perform the combine "MOVMSK(CONCAT(X,Y)) == 0 -> MOVMSK(OR(X,Y))".
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Create 2 users for MOVMSK to test if compiler would perform the combine "MOVMSK(CONCAT(X,Y)) == 0 -> MOVMSK(OR(X,Y))".