[clang] [clang][modules][deps] Add mutex as an alternative to file lock (PR #129751)

[Jan Svoboda via cfe-commits]

================
@@ -95,6 +96,10 @@ class DependencyScanningService {
     return SharedCache;
   }
 
+  ModuleCacheMutexes &getSharedModuleCacheMutexes() {
----------------
jansvoboda11 wrote:

We don't _need_ it, but we currently call 
`std::make_shared<ModuleCacheMutexLock>` for each TU, which is unnecessary. We 
could just do that on service construction and avoid future allocations.

https://github.com/llvm/llvm-project/pull/129751
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