Gary reports the GCC 10 will emit calls to atomics intrinsics routines
unless -mno-outline-atomics is specified. This means GCC-10 introduces
new intrinsics, and even though it would be possible to work around this
by specifying the command line option, this would require a new GCC10
toolchain profile to be created, which we prefer to avoid.

So instead, add the new intrinsics to our library so they are provided
when necessary.

Signed-off-by: Ard Biesheuvel <[email protected]>
Tested-by: Gary Lin <[email protected]>
Acked-by: Laszlo Ersek <[email protected]>
Reviewed-by: Leif Lindholm <[email protected]>
Reviewed-by: Philippe Mathieu-Daude <[email protected]>