[clang] [clang][Dependency Scanning] Adding an API to Diagnose Invalid Negative Stat Cache Entries (PR #135703)

[Jan Svoboda via cfe-commits]

jansvoboda11 wrote:

(To be frank, I think it would be better to enforce the consistency of VFSs by having the service own one and the workers just applying overlays as needed, but that's definitely out of scope for this patch.)

https://github.com/llvm/llvm-project/pull/135703