swift234

Revert "[Set/Dictionary] Eliminate "bridging" collection entrypoints."

This reverts commit dc0ae675bc6af4b6a0819561fc2e5ec665187053. The
change here (presumably the change to Foundation) caused a regression
in several of the bridging-related benchmarks, e.g.,
ObjectiveCBridgeFromNSSetAnyObjectToString, DictionaryBridge,
ObjectiveCBridgeFromNSDictionaryAnyObjectToString.