swift234

Pull 'try' et al inside RebindSelfInConstructorExprs.

And give a proper warning when you use 'try?' in a non-failable init.

And do the right thing when trying to SILGen 'try?' delegating to a
failable throwing init.

And make sure DI understands that this is, in fact, an initialization.

More rdar://problem/21692467

Swift SVN r31060