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.
Approved by: re (cperciva)
MFC after: 3 days
(cherry picked from commit 51e8e8b0f36933814b1be08913857727876aece5)
(cherry picked from commit 7778507bf9344cef75f30c4089536d847da5d558)