[HarfBuzz] Testing recent changes in HarfBuzz

[Behdad Esfahbod]

Khaled, Jonathan, others,

While I was away I implemented a few optimizations and other fixes that I
think I might have got wrong a bit.  I'm fairly confident in them, but then
can use some testing, specially with complex recursive lookups, etc.  Would
you mind giving it some testing (Amiri, whatever test suites you might be able
to run)?

I'm planning to make a release later today or tomorrow.

Thanks,
-- 
behdad
http://behdad.org/