Make bridgeFromObjectiveC return non-optional.
Make bridgeFromObjectiveC return non-optional.

Now that we use bridgeFromObjectiveCConditional to perform conditional
bridging, make bridgeFromObjectiveC handle forced bridging. For the
latter, deferred checking is acceptable.

Almost all of <rdar://problem/17319154>.


Swift SVN r19046

apple/swift-corelibs-foundation,apple/swift-corelibs-foundation,apple/swift-corelibs-foundation,apple/swift-corelibs-foundation,apple/swift-corelibs-foundation