[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:

Find myself wishing we could combine this with at least `PartialOrdering` in an enum of some sort.  

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