[Bug rtl-optimization/87761] [9 regression][MIPS] New FAIL: gcc.target/mips/fix-r4000-10.c -O1 start with r265398

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87761

--- Comment #7 from Segher Boessenkool <segher at gcc dot gnu.org> ---
truncate:SI of ashift:DI looks wrong already; I'd expect ashift:SI of a subreg?