Implement LWG issue 2720. Replace perms::resolve_symlinks with perms::symlink_nofollow.

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
4 files changed