fixed #95641 pointless string copy

Author: sommersun

llvm/include/llvm/TableGen/Record.h

@@ -142,6 +142,7 @@ class BitsRecTy : public RecTy {
 
   unsigned getNumBits() const { return Size; }
 
+
   std::string getAsString() const override;
 
   bool typeIsConvertibleTo(const RecTy *RHS) const override;
@@ -1966,7 +1967,7 @@ class RecordKeeper {
     return It == ExtraGlobals.end() ? nullptr : It->second;
   }
 
-  void saveInputFilename(std::string Filename) {
+  void saveInputFilename(std::string && Filename) {
     InputFilename = Filename;
   }
 

llvm/lib/TableGen/Main.cpp

@@ -113,7 +113,7 @@ int llvm::TableGenMain(const char *argv0,
     return reportError(argv0, "Could not open input file '" + InputFilename +
                                   "': " + EC.message() + "\n");
 
-  Records.saveInputFilename(InputFilename);
+  Records.saveInputFilename(std::move(InputFilename));
 
   // Tell SrcMgr about this buffer, which is what TGParser will pick up.
   SrcMgr.AddNewSourceBuffer(std::move(*FileOrErr), SMLoc());