swift234

IRGen: Kludge instantiated generic classes into getting initialized as ObjC classes.

In the fun case where you create an object of a non-ObjC-derived generic Swift class and hand it off as a DynamicLookup or other class existential, the first ObjC-like thing that happens to that object is that it gets sent the "release" message in the context that only knows of it as an ObjC object. It turns out this is bad; magic happens when the first class method is sent to an ObjC class. In the normal case this is +alloc, but in our case, Swift's runtime has instantiated a class and allocated an object completely independent of the ObjC runtime. To fix this problem and avoid similar problems in the future, emit a useless call to +class in the generic metadata fill function for generic metadata patterns to force this initialization. We should be able to roll this back when we properly register generic class instances with the ObjC runtime (<rdar://problem/15306370>). In the meantime, this fixes <rdar://problem/15674812>.

Swift SVN r11407