This is caused by a toolchain bug and has been reported to GCC a
while a ago without receiving any responses yet [1]. Fix it at the
moment by not compiling with mips16 enabled.
Should fix#1750 and #1904.
[1] Bug 71519 - "Out of range operand" bteqz inst generated by
"casesi_internal_mips16_<mode>",
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71519
Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>