[llvm] [clang] [clang][MBD] set up module build daemon infrastructure (PR #67562)

[Jan Svoboda via cfe-commits]

jansvoboda11 wrote:

> This seems like something that shouldn't be in the compiler binary itself. There should be a separate binary for this type of thing.

Discussed here: https://discourse.llvm.org/t/rfc-modules-build-daemon-build-system-agnostic-support-for-explicitly-built-modules/71524

https://github.com/llvm/llvm-project/pull/67562