Comment # 8 on bug 1170376 from Aaron Puchert

(In reply to Michael Matz from comment #6)
> But there's a slight difference to traditional mtune behaviour: in this case
> there are calls to external routines inserted, not just some slight
> preferences in using (say)  shl x,1 vs. an add x,x instructions.
That makes sense indeed, it's a bit different.

(In reply to Guillaume GARDET from comment #7)
> GCC 10.1 will enbale '-moutline-atomics' by default.
So we don't need to explicitly enable the flag, and I don't need to patch Clang
to ignore it, right?