bdc3ce9e8f
For redirected file entries, `FileEntryRef::getDir()` returns the parent directory entry of the target file entry. This differs from `FileEntry::getDir()` that always returns the parent directory that was last used to look up that file. After switching from `FileEntry` to `FileEntryRef` for umbrella headers in D142113, this discrepancy became observable and caused Clang to emit incorrect diagnostics. This patch changes Clang so that it always associates `FileEntryRef` with the parent directory that was used to look it up. This brings its behavior closer to `FileEntry`, but without the hacky mutation. This also ensures that `llvm::sys::path::parent_path(FileRef->getNameAsRequested()) == FileRef->getDir()->getName()`. Previously, `FileRef->getDir()` would fall underneath the redirecting VFS into the world of on-disk paths. Reviewed By: benlangmuir, rmaz Differential Revision: https://reviews.llvm.org/D151398
The LLVM Compiler Infrastructure
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