[clang] [clang] Implement CTAD for type alias template. (PR #77890)

[Haojian Wu via cfe-commits]

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@@ -96,6 +96,10 @@ C++20 Feature Support
   behavior can use the flag '-Xclang -fno-skip-odr-check-in-gmf'.
   (`#79240 <https://github.com/llvm/llvm-project/issues/79240>`_).
 
+- Initial support for class template argument deduciton (CTAD) for type alias
+  templates.
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hokein wrote:

Done.

https://github.com/llvm/llvm-project/pull/77890