[clang] [clang-tools-extra] [clang] Implement CWG2398 provisional TTP matching to class templates (PR #94981)

[Matheus Izvekov via cfe-commits]

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@@ -6803,9 +6809,6 @@ bool CXXNameMangler::mangleSubstitution(QualType T) {
 }
 
 bool CXXNameMangler::mangleSubstitution(TemplateName Template) {
-  if (TemplateDecl *TD = Template.getAsTemplateDecl())
-    return mangleSubstitution(TD);
-
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mizvekov wrote:

This one looks like it was a rebasing mistake. Restored.

https://github.com/llvm/llvm-project/pull/94981