re: toolchain/58411: GCC/x86_64 10.5 and 12.4 miscompile GCC/sh3 12.4

[matthew green <mrg%eterna23.net@localhost>]

i've commited the main GCC 12.x sh fix to -current.

while looking at the recent GCC changes in gcc/config/sh/ i noticed these
three that look interesting:

   https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=f49267e1636872128249431e9e5d20c0908b7e8e

which seems to fix some optimisation pass issues, and could be merged into
our GCC 12 i think.

   https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=58b78cf068b3b24c11d7812a5f4de865e9cdb8b4

which looks like the future has some code-size reduction coming, but
maybe not until GCC 14 or 15...


.mrg.