swift234

This is the equivalent of r24737 for iOS

"Only remove the view from the set of views that are being Mirror-drawn when you're actually done reflecting on it  The previous code would always remove the view on exit, even if it had not previously added it (default: case of the switch)  In simple cases, this didn't really matter, but if you caused the logger to be reinvoked on self in a loop, then you would end up removing the view before you were done looping over it, and eventually run out of stack space"

In this case, it fixes rdar://20193122



Swift SVN r26235