test: fix bug in checks.sh that was causing zero exit status in some failing runs.
trumptr: avoid internal functions (except checkargs) and call can_hold_pointer via inline.
libcrunch_cil_inlines.h: minor cleanup.
C++: very simple hello-world static_cast now works.
Fix void-pointer-pointer handling in the case of stack addresses.
test/Makefile: mark pointer-degree as checked for successful completion only.
Add simple caching for is_a results. Does not perform very well.
Use low-order bit of insert uniqtype/alloc_site field to track strictness of storage contract.
Check pointers output from va_arg. Refactor trumptr a bit in the process.