[clang] [clang-tools-extra] [lldb] [Clang] [c++20] P1907R1: Support for generalized non-type template ar… (PR #77428)

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cor3ntin wrote:

@bolshakov-a we are going to branch LLVM 23 in about 10 days. If you can update this by early next week, we will try to finish the review so that it can land in 18.

https://github.com/llvm/llvm-project/pull/77428