[clang] [clang] disallow narrowing when matching template template parameters (PR #124313)

[Erich Keane via cfe-commits]

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@@ -11682,6 +11683,7 @@ class Sema final : public SemaBase {
                         SmallVectorImpl<TemplateArgument> &SugaredConverted,
                         SmallVectorImpl<TemplateArgument> &CanonicalConverted,
                         CheckTemplateArgumentKind CTAK, bool PartialOrdering,
+                        bool PartialOrderingTTP,
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erichkeane wrote:

This is a case where I would really like to stop the bleeding, so I'd like to find a better solution than just a pair of bools here.  If you have a patch to do the refactor, it would be nice to land that first to see its effect in action.

https://github.com/llvm/llvm-project/pull/124313