Go on past a runaway GSUB as HarfBuzz does

A font whose GSUB grows the buffer past its bounds (text-rendering-tests'
GSUB-3) made vega_shape fail. HarfBuzz goes on with the glyphs of the last
pass that finished: every later pass does nothing, positions are the
default advances. Vega's buffer operations already stand still once the
buffer is unsuccessful, so it now goes on too, and a broken font shows
what HarfBuzz shows rather than nothing. HarfBuzz's suite: 5018 of 5199
the same, none failing.

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