[clang] [Clang] Fix crash when type-name is combined with class specifier in template argument (PR #191689)

[Oliver Hunt via cfe-commits]

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@@ -0,0 +1,13 @@
+// RUN: %clang_cc1 -fblocks -fsyntax-only -verify %s
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ojhunt wrote:

let's simplify this test case, remove `-fblocks` as it's unnecessary

https://github.com/llvm/llvm-project/pull/191689