Jan Svoboda febd3de07d [clang] Get the directory identity from ModuleCache instead of FileManager (#193070) ...

Using `FileManager`'s caching and deduplication functionality for
assigning identity to the module cache is handy, but it relies on two
assumptions:
* the rest of the compiler consistently calls
`FileManager::getOptionalDirectoryRef()` with `/*CacheFailure=*/false`
for the module cache path,
* the VFS is not caching failed stats for the module cache path.

This PR implements this functionality in the `ModuleCache` interface,
which is conceptually the right place for it. This PR enables us to land
the VFS simplifications in
https://github.com/llvm/llvm-project/pull/190843.

2026-04-21 17:39:59 +00:00

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