[HarfBuzz] fallback kern optimization

[Behdad Esfahbod]

Applied.  Thanks.

On 13-10-27 07:53 PM, Jonathan Kew wrote:
> It's a relatively small thing, but we can get a slight win for the case where
> kerning has been disabled if we add an early return to
> _hb_ot_shape_fallback_kern().
> 
> Looks to me like we can also reduce the use of buffer->... there when kerning
> is being applied, which might help a bit (depending how well the compiler
> optimizes stuff.)
> 
> These changes seem to yield a small but just-about-measurable improvement with
> old fonts that lack GPOS kerning.
> 
> JK

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