Implemented trip-count safety information.

As shown in the induction analysis presentation, trip-counts need to
deal with potential taken/not-taken situations (so that trip-count
is either valid in the full loop or just in the loop-body proper)
and potential finite/infinite situations (the latter can still be
analyzed but may need to run-time test later to guard against the
infinite conditions). This CL provides that information.

Change-Id: I0445d8e836b80a3614af217ce3e39d766e77b986