Merge commit 4a39d0890894 from llvm-project (by Mark Johnston):

Merge commit 4a39d0890894 from llvm-project (by Mark Johnston):

  [libc++] Fix filesystem::remove_all() on FreeBSD (#79540)

  remove_all_impl() opens the target path with O_NOFOLLOW, which fails if
  the target is a symbolic link. On FreeBSD, rather than returning ELOOP,
  openat() returns EMLINK. This is unlikely to change for compatibility
  reasons, see https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214633 .

  Thus, check for EMLINK as well.

Reported by:	markj
PR:		276632
MFC after:	3 days