llvm-project

847e1acb - [clang][modules] Remove `ModuleManager` in-memory buffers (#194753)

[clang][modules] Remove `ModuleManager` in-memory buffers (#194753) The last remaining undesirable `FileManager` usage in `ModuleManager::addModule()` is the lookup in the in-memory buffers map. This PR merges that functionality with the `InMemoryModuleCache`, simplifying the code and removing unnecessary file system access via `ModuleManager::lookupBuffer()`. This is also useful downstream, where we already use the `InMemoryModuleCache` for PCMs loaded from CAS, but don't have an explicit way to represent the PCM location in `ModuleFile{Name,Key}`.