swift234

Integrate type checking of default arguments into the type checking of the function/constructor body.

This eliminates the odd separate pass over default arguments, as well
as the isFirstPass distinction for type checking patterns,
centralizing default argument checking. It actually regresses us
slightly (see <rdar://problem/14488311>) due to name binding happening
too early (and, therefore, in the wrong context). This will be fixed
by moving name binding into constraint generation.


Swift SVN r6368