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the dependency scanner on a single worker thread
This behavior can be controlled using the new `-reuse-filemanager` clang-scan-deps
option. By default the file manager is reused.
The added test/ClangScanDeps/symlink.cpp is able to pass with
the reused filemanager after the related FileEntryRef changes
landed earlier. The test test/ClangScanDeps/subframework_header_dir_symlink.m
still fails when the file manager is reused (I run the FileCheck with not to
make it PASS). I will address this in a follow-up patch that improves
the DirectoryEntry name modelling in the FileManager.
llvm-svn: 370420
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