[HarfBuzz] optimize setting feature masks in the buffer

[Jonathan Kew]

Hi Behdad,

Here's a patch implementing a minor optimization of the process of setting the feature bits in the buffer.

Two things: first, check the features for the common case of (start, end) = (0, -1), collect those "global" values into a single mask, and set them all in a single pass over the buffer. And second, for features that don't use this "global" range, use a binary search to find the start position and then iterate only as far as the end of the feature range, not the end of the buffer.

JK

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