swift234

Runtime: Intercept -_tryRetain on the magic base classes of bridged containers.

Strings that get used to name SpriteKit nodes on Mavericks end up weakly referenced by NSMapTables using the legacy GC-compatible weak pointer personality, which for our bridged objects ended up falling into the default NSObject implementation of reference counting via the "_tryRetain" SPI, causing heap corruption. I tried really hard to isolate a test case and failed, but this fixes the Adventure crasher in <rdar://problem/17887502>.

Swift SVN r20966