Revert "Merge commit e24f90190c77 from llvm git (by Brad Smith):"
[Driver] Enable outline atomics for FreeBSD/aarch64 (#156089)
The compiler_rt helper functions have been built since 12.4, 13.1, 14
and anything newer.
This reverts commit 51e8e8b0f36933814b1be08913857727876aece5.
MFC after: immediately