Previously, bug reducer tester would just assert when it saw a direct apply to
its target function. Now we add support for also causing a miscompile by just
deleting the apply. This is tested by eliminating an apply to putchar to ensure
we are not dependent on any stdlib details.
Now once you have a pass list using:
./bug-reducer opt ...
You can take the pass list and give it and the output file to bug-reducer func:
./bug-reducer func ...
which will reduce the function list for you given a pass list. This is kept
separate to allow for testing and orthogonality. In a future commit, I am going
to add an option to ./bug-reducer opt that will invoke the function reducer
automagically.
