Revert "[SILGen] Enable protocol extension version of _unconditionallyBridgeToObjectiveC"
Revert "[SILGen] Enable protocol extension version of _unconditionallyBridgeToObjectiveC"

This reverts commit bec64ccfe392b04c0b982e8b75f204637ab1052b.

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