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

[Iain Sandoe via cfe-commits]

iains wrote:

A possible mechanism might be to have a watchdog process, with which instances of the server are registered with a time-to-live.  I guess this might be easier to construct as a scheme for test-suites than for end-user.


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