[TableGen] Remove unnecessary StringRef constructor call from LessRecord(). NFC

Record::getName already returns a StringRef. When this code was
originally written getName returned const std::string &.

Author: topperc

llvm/include/llvm/TableGen/Record.h

@@ -2098,7 +2098,7 @@ class RecordKeeper {
 /// Sorting predicate to sort record pointers by name.
 struct LessRecord {
   bool operator()(const Record *Rec1, const Record *Rec2) const {
-    return StringRef(Rec1->getName()).compare_numeric(Rec2->getName()) < 0;
+    return Rec1->getName().compare_numeric(Rec2->getName()) < 0;
   }
 };