[PATCH] D13658: [VFS] Let the user decide if they want path normalization.

[Benjamin Kramer via cfe-commits]

bkramer created this revision.
bkramer added a reviewer: klimek.
bkramer added a subscriber: cfe-commits.

This is a more principled version of what I did earlier. Path
normalization is generally a good thing, but may break users in strange
environments, e. g. using lots of symlinks. Let the user choose and
default it to on.

This also changes adding a duplicated file into returning an error if
the file contents are different instead of an assertion failure.

http://reviews.llvm.org/D13658

Files:
  include/clang/Basic/VirtualFileSystem.h
  lib/Basic/VirtualFileSystem.cpp
  unittests/Basic/VirtualFileSystemTest.cpp

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