[clang] [llvm] Added partial support for compiling C++20 modules and header-units without scanning. (PR #147682)

[Chris B via cfe-commits]

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llvm-beanz wrote:

Code contributed to LLVM should be made available under the LLVM license whenever possible (see the [developer policy](https://llvm.org/docs/DeveloperPolicy.html#copyright-license-and-patents). If you're unwilling to contribute this code under the LLVM license we'll need to discuss alternatives, but it is likely the contribution will require extra scrutiny.

https://github.com/llvm/llvm-project/pull/147682