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This changes how filesystem::permissions(p, perms) handles symlinks. Previously symlinks were not resolved by default instead only getting resolved when "perms::resolve_symlinks" was used. After this change symlinks are resolved by default and perms::symlink_nofollow must be given to change this. This issue has not yet been moved to Ready status, and I will revert if it doesn't get moved at the current meeting. However I feel confident that it will and it's nice to have implementations when moving issues. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@273328 91177308-0d34-0410-b5e6-96231b3b80d8