Estimated hours taken: 3
commit_bug_2:
A new test case to exercise calls within nested commits in model_non
procedures. It will test the bug I just fixed in code_info when we
start using native gc, but it is useful test case of nested commits
anyway.
nondet_ite_3:
A new test case for testing the handling of if-then-elses that
have a semidet condition but are nevertheless nondet.
Mmake:
Enable these two test cases, as well as double_error2.
