* If a procedure does not make non-tail calls, stack-overflow is eliminated.
* If a procedure does not make any calls (leaf routine), then event-check
is eliminated as well.
(total savings: about 10% reduction in boot-file size)
insert-stack-overflow-check. This will make it easier to remove
unnecessary stack checks and to add some that we *may* be
missing.
* Added a $stack-overflow-check primitive that takes care of checking
and calling ikrt_stack_overflow if we did detect an overflow.
Abdulaziz Ghuloum