[clang] [libcxxabi] [clang][ItaniumMangle] Mangle friend function templates with a constr… (PR #110247)

[Viktoriia Bakalova via cfe-commits]

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@@ -704,6 +704,15 @@ ItaniumMangleContextImpl::getEffectiveDeclContext(const Decl *D) {
       return D->getLexicalDeclContext()->getRedeclContext();
   }
 
+  if (const auto *FTD = dyn_cast<FunctionTemplateDecl>(D)) {
+    // Member-like constrained friends are mangled as if they were members of
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VitaNuo wrote:

Great idea!

https://github.com/llvm/llvm-project/pull/110247