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

[Vlad Serebrennikov via cfe-commits]

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Endilll wrote:

Now that you published P3310R0, this test can be moved to DR tests with a status `// cwg2398: 19 drafting P3310R0`.

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