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

[Jan Svoboda via cfe-commits]

================
@@ -108,6 +108,32 @@ DependencyScanningFilesystemSharedCache::getShardForUID(
   return CacheShards[Hash % NumShards];
 }
 
+void DependencyScanningFilesystemSharedCache::diagnoseNegativeStatCachedPaths(
----------------
jansvoboda11 wrote:

Shouldn't this be taking locks? If there's a precondition that no other threads use this object, we should at least reflect that in the documentation.

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