Due to a now default-enabled `undef` pass (llvm/llvm-project
1b1c8d83d3567a60280291c0adb95d1d60335509), a whole bunch of interop
IRGen tests are failing due to missing `undefs`, even though they don't
matter in these tests at all. Add regex matches so that these tests just
check for the name and types of the functions they care about.
If a static variable can be evaluated at compile time, create an
accessor using that value. This means static variables will always be
inlined and removed.
Note: currently this only works with numeric types.
