[Bug target/71519] "Out of range operand" bteqz inst generated by "casesi_internal_mips16_"

[ggo at andred dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71519

--- Comment #1 from André Draszik <ggo at andred dot net> ---
Artificially, this looks similar to bug 77757 (which has actual test cases
attached)