swift234

IRGen: Use the parameter convention of 'self' when partial_apply'ing ObjC methods

Now that SIL function values carry their full parameter types around at all times (thanks John!), partial_apply can do the right thing for methods with weird conventions. We should really do this for all partial_apply's, but it matters most for ObjC thunks to fix the leak in <rdar://problem/15120887>.

Swift SVN r10583