[TableGen] Use std::move. NFC

Summary: Fix #98719

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Differential Revision: https://phabricator.intern.facebook.com/D60251658

Author: MaskRay

llvm/utils/TableGen/Common/GlobalISel/GlobalISelMatchTable.h

@@ -1175,7 +1175,7 @@ class CmpPredicateOperandMatcher : public OperandPredicateMatcher {
 public:
   CmpPredicateOperandMatcher(unsigned InsnVarID, unsigned OpIdx, std::string P)
       : OperandPredicateMatcher(OPM_CmpPredicate, InsnVarID, OpIdx),
-        PredName(P) {}
+        PredName(std::move(P)) {}
 
   bool isIdentical(const PredicateMatcher &B) const override {
     return OperandPredicateMatcher::isIdentical(B) &&