compiler/type_util.m:
Treat complete switches on 8- and 16-bit fixed sized integers as det.
(We don't do the same for the other fixed size integer types, since having
a complete switch on them is not practical anyway.)
tests/valid/Mmakefile:
tests/valid/compare_{int8,uint8}_switch.m:
Add a test for complete switches on the 8-bit integer types.
