[clang-tools-extra] [clangd] [C++20] [Modules] Introduce initial support for C++20 Modules (PR #66462)

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guijiyang wrote:

> @sam-mccall gentle ping~

@ChuanqiXu9 hi, can your patch add support msvc module with *.ixx suffix source? I use xmake to generate compile database, clangd cant work properly.


https://github.com/llvm/llvm-project/pull/66462