Don't try the accelerated glyphs path for component-alpha text (which I

    don't expect drivers to be able to accelerate without exa assistance).
    Instead, drop back to plain old miGlyphs for a 62.5% +/- 1.5% reduction
    in runtime of my ls -lR test (n=5) with component alpha. While a
    reasonable approach would seem to be making a better test to see
    whether the entire path would be accelerated and force migration
    appropriately, my attempt at this made the situation much worse.

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