[llvm] fixed #95641 pointless string copy (PR #127325)

[Simon Pilgrim via llvm-commits]

================
@@ -1966,9 +1966,7 @@ class RecordKeeper {
     return It == ExtraGlobals.end() ? nullptr : It->second;
   }
 
-  void saveInputFilename(std::string Filename) {
-    InputFilename = Filename;
-  }
+  void saveInputFilename(std::string &&Filename) { InputFilename = Filename; }
----------------
RKSimon wrote:

Why not this instead?
```
void saveInputFilename(std::string Filename) { InputFilename = std::move(Filename); }
```

https://github.com/llvm/llvm-project/pull/127325