[llvm] [NFC][LLVM][ADT] Change a few `const StringRef &` arguments to value (PR #163994)

[Rahul Joshi via llvm-commits]

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@@ -21,6 +21,7 @@
 #include "llvm/ADT/Hashing.h"
 #include "llvm/ADT/STLForwardCompat.h"
 #include "llvm/ADT/STLFunctionalExtras.h"
+#include "llvm/ADT/StringRef.h"
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jurahul wrote:

Done.

https://github.com/llvm/llvm-project/pull/163994