[Bug target/65249] unable to find a register to spill in class 'R0_REGS' when compiling protobuf on sh4

[kkojima at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65249

--- Comment #12 from Kazumoto Kojima <kkojima at gcc dot gnu.org> ---
It turned out that the patch in c#10 easily produces wrong codes.
Now I'm testing another adhoc fix.