[clang] [clang-cl] Fix value of __FUNCTION__ in MSVC mode. (PR #84014)

[via cfe-commits]

================
@@ -1635,6 +1635,17 @@ void TypePrinter::printElaboratedBefore(const 
ElaboratedType *T,
     if (T->getKeyword() != ElaboratedTypeKeyword::None)
       OS << " ";
     NestedNameSpecifier *Qualifier = T->getQualifier();
+    if (!Policy.SuppressTagKeyword && Policy.SuppressScope &&
+        !Policy.SuppressUnwrittenScope) {
+      std::string prefix = T->isClassType()       ? "class "
+                           : T->isStructureType() ? "struct "
+                           : T->isUnionType()     ? "union "
+                                                  : "";
----------------
Sirraide wrote:

```suggestion
      StringRef prefix = T->isClassType()       ? "class "
                         : T->isStructureType() ? "struct "
                         : T->isUnionType()     ? "union "
                                                : "";
```

Don’t think we need a string here.

https://github.com/llvm/llvm-project/pull/84014
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