swift234

Mark calls to [auto_closure] variables as [transparent]. Technically, we only want this to apply to parameters; however, I'm told that the plan on record is for [auto_closure] only to be allowed on parameters anyway and that the parser accepting local variable [auto_closures] is a bug, so I've implemented this assuming that will be fixed. This does not require [auto_closure] to be in the SIL type system; the [auto_closure] type information is pulled from the AST during lowering.

Note that this does not actually require the function containing the [auto_closure] parameter to be marked [transparent]. However, if the function is not marked [transparent], then the [transparent] flag on the application of the [auto_closure] will have no effect anyway because the callee of the function will not be visible, so there's no harm in putting the flag on without checking.

Swift SVN r7904