Hang getting occurrence with RRULE that has BYDAY and BYMONTHDAY

One of the Lightning unit tests is hanging with ical.js, I've created an equivalent testcase for ical.js. The core issue in libical can be seen in [bug 356207](https://bugzilla.mozilla.org/show_bug.cgi?id=356207).

I've tried to apply the fix to ical.js, but its not changing anything. Maybe I did something wrong.

Begin with the equivalent ical.js testcase mentioned in the issue and compare its RRULE handling with libical bug 356207. Trace the BYDAY and BYMONTHDAY occurrence lookup until the hang is reproduced; done means the testcase completes and returns the expected occurrence.

Written by the indexing model from the issue text.