Should ARMv8-A generic tuning default to -moutline-atomics

[Florian Weimer via Gcc]

Distributions are receiving requests to build things with
-moutline-atomics:

  <https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=956418>

Should this be reflected in the GCC upstream defaults for ARMv8-A
generic tuning?  It does not make much sense to me if every distribution
has to overide these flags, either in their build system or by patching
GCC.

Thanks,
Florian