Jordan Rose d0a9ec509e [Serialization] Drop overriding properties with missing bases. ...

Like the previous commit, but with added trickiness because we also
serialize the form of the PatternBindingDecl a property came from.
Make getPattern handle a failure in the simple case that overrides
use, and pass that up to the PatternBindingDecl initialization. (This
can result in zero-element PatternBindingDecls, but that's fine.)

'getPattern' is also a change from 'maybeGetPattern', but every caller
knows how many patterns it expects, so accomodating the "maybe" case
is no longer important.

2017-04-11 10:37:30 -07:00

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