This decreases total testing time by over a minute on my old Mac Pro.
It probably has much less effect on systems with fewer cores, but shouldn't
be any worse there.
Swift SVN r22745
Giving the invocation target proxy a type will be bogus when we turn on 'dynamic'. This breaks the NSUndoManager tests because we still can't work with lvalues through AnyObject. <rdar://problem/17755906>
Swift SVN r20283
This method returns a proxy object. Swift cannot current cast proxy objects
to their proxied types. The workaround for now is to add a generic overlay
for -prepareWithInvocationTarget: so the declared type of the returned
proxy is the proxied type. This is good enough to make undo proxies work with
objc-dispatched calls.
Swift SVN r18155
