[clang] [Clang] Add warning message for C++17 alias template CTAD (PR #133806)

[Erich Keane via cfe-commits]

================
@@ -9920,7 +9920,9 @@ QualType 
Sema::DeduceTemplateSpecializationFromInitializer(
     if (auto *AliasTemplate = dyn_cast_or_null<TypeAliasTemplateDecl>(
             TemplateName.getAsTemplateDecl())) {
       Diag(Kind.getLocation(),
-           diag::warn_cxx17_compat_ctad_for_alias_templates);
+           getLangOpts().CPlusPlus20
----------------
erichkeane wrote:

Ah :)  I was just blaming my bad memory.  I just got back from a week off, so 
my brain isn't particularly caught up yet :D 

https://github.com/llvm/llvm-project/pull/133806
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