[clang] [clang] fix P3310 overload resolution flag propagation (PR #125372)

[Erich Keane via cfe-commits]

================
@@ -2525,8 +2525,11 @@ void TextNodeDumper::VisitCXXRecordDecl(const CXXRecordDecl *D) {
     OS << " instantiated_from";
     dumpPointer(Instance);
   }
-  if (const auto *CTSD = dyn_cast<ClassTemplateSpecializationDecl>(D))
+  if (const auto *CTSD = dyn_cast<ClassTemplateSpecializationDecl>(D)) {
     dumpTemplateSpecializationKind(CTSD->getSpecializationKind());
+    if (CTSD->hasMatchedPackOnParmToNonPackOnArg())
+      OS << " strict_pack_match";
----------------
erichkeane wrote:

```suggestion
      OS << " strict-pack-match";
```

mild preference?  And I see we are inconsistent of course, so do what you want.  Feel free to NFC them to something less... underscory if you agree.

https://github.com/llvm/llvm-project/pull/125372