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

[Chuanqi Xu via cfe-commits]

================
@@ -442,6 +448,9 @@ ParsedAST::build(llvm::StringRef Filename, const ParseInputs &Inputs,
       std::move(CI), PreamblePCH,
       llvm::MemoryBuffer::getMemBufferCopy(Inputs.Contents, Filename), VFS,
       *DiagConsumer);
+
+  // Clangd Modules TODO: refactor the command line options of `Clang` here.
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ChuanqiXu9 wrote:

Done.

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