[Bug target/83496] MIPS BE: wrong code generates under "-Os -mbranch-cost=1"

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83496

--- Comment #13 from Segher Boessenkool <segher at gcc dot gnu.org> ---
There are *two* conditional branches leading to that "return 1".  After
dbr one is a delay-slot seq, and the other has lost the assignment of the
return value.