* less branching by passing parameters in the main op code switch.
* properly pass the target when asking the type system for int info.
* handle u8, i16, etc when it is represented using
int_unsigned/int_signed tag.
* compile error instead of assertion failure for unimplemented cases
(greater than 64 bits integer).
* control flow cleanups
* zig.h: expand macros into inline functions
* reduce the complexity of the test case by making it one test case
that calls multiple functions. Also fix the problem of c_int max
value mismatch between host and target.
9dbe684854