Hi,
I am sending a revised patch, now with different tests for N64/N32 and O32 ABIs.
For the O32 ABI, I've skipped the -O0 and -Os pipelines, considering there is a
difference between exact offsets for store instructions (the registers used remain
the same).

Skipping -flto isn't really necessary, so I've removed that part.

I've fixed the Changelog, hopefully I've corrected the mistakes I made.

Regards,
Jovan