[cfe-dev] RFC: Improving Clang's FileManager

[Harlan Haskins via cfe-dev]

> Additionally to fixing the issue described above, Harlan (CCed) and I would like to also perform the following minor cleanups and improvements:
> 
> - Start using error_code/ErrorOr for FileManager for improved API.

As a first step of this refactor, I’ve posted a patch that changes FileManager::getFile and FileManager::getDirectory to use llvm::ErrorOr.

https://reviews.llvm.org/D65534 <https://reviews.llvm.org/D65534>

It’s a big patch, but the bulk of the changes are updating clients throughout clang, lldb, and clang-tools-extra.

— Harlan
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