[clang] [llvm] [clang][modules] Prevent deadlock in module cache (PR #182722)

[Jan Svoboda via llvm-commits]

jansvoboda11 wrote:

In 2d9729d I tried a different approach to what's described in the PR. Still, some tests fail. This still needs some work.

https://github.com/llvm/llvm-project/pull/182722