Update 'Failable Initializers' proposal with feedback from Jordan Rose and Joe Groff
Update 'Failable Initializers' proposal with feedback from Jordan Rose and Joe Groff

Basically, the Objective-C side of the equation was too simplistic
and had to be re-thought. We need to handle -release being sent to
a partially-initialized instance, so unfortunately in the general
case we have to add some state to the instance itself.

Swift SVN r32170

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