[Bug target/102089] MIPS: use N64 ABI by default if the triple end with -gnuabi64

[syq at debian dot org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102089

--- Comment #3 from YunQiang Su <syq at debian dot org> ---
https://gcc.gnu.org/pipermail/gcc-patches/2021-August/578240.html

Patch has been sent to gcc-patches.