Michael Gottesman 79b225ffa8 [silgen] Fix up EnumElementPatternInitialization::emitEnumMatch to use ownership. ...

This commit does a few things:

1. It uses SwitchEnumBuilder so we are not re-inventing any wheels.
2. Instead of hacking around not putting in a destroy for .None on the fail
pass, just *do the right thing* and recognize that we have a binary case enum
and in such a case, just emit code for the other case rather than use a default
case (meaning no cleanup on .none).

rdar://31145255

2017-03-29 15:36:41 -07:00

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