[Bug target/91635] wrong code at -O2 with __builtin_add_overflow() and shifts

[kito at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91635

--- Comment #17 from Kito Cheng <kito at gcc dot gnu.org> ---
Hi Jakub:

Thanks your patch, I've run with gcc testsuite and no new fails, and I am
ruining more gcc testsuite regression with different arch/abi combination for
that.

I am amazing that seems like RISC-V is first back-end use paradoxical_subreg_p
:P


Hi Jim:
Basically my local patch is almost same as Jakub, so I think you can use
Jakub's  directly if you think that's OK.