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

[Aaron Ballman via cfe-commits]

================
@@ -1022,7 +1039,13 @@ void DeclPrinter::VisitVarDecl(VarDecl *D) {
              ? D->getIdentifier()->deuglifiedName()
              : D->getName();
 
-  printDeclType(T, Name);
+  if (!Policy.SuppressTagKeyword && Policy.SuppressScope &&
+      !Policy.SuppressUnwrittenScope) {
+    MaybePrintTagKeywordIfSupressingScopes(Policy, T, Out);
+    printDeclType(T, Name);
+  } else {
+    printDeclType(T, Name);
+  }
----------------
AaronBallman wrote:

```suggestion
  if (!Policy.SuppressTagKeyword && Policy.SuppressScope &&
      !Policy.SuppressUnwrittenScope)
    MaybePrintTagKeywordIfSupressingScopes(Policy, T, Out);
  printDeclType(T, Name);
```

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