Wyatt Allen c5794e442d Improve performance for unsupported languages
Applies a minor performance improvement when both sides of the diff are
labeled by an unsupported language. Previously, the GR-SYNTAX-LAYER
`process` method would needlessly traverse the entire diff when the
languages were not in the support map. With this change, the `process`
method resolves early in such a scenario.

Change-Id: I8e5ef9fa410facdd60ca33c234ced682ffb182d7
2016-08-05 15:05:32 -07:00
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