Revert "Name and label changes for closure parameters (for review only) (#2981)"
Revert "Name and label changes for closure parameters (for review only) (#2981)"

This reverts commit 0c6d53194f8f05f2d4bfc2f6862f8e2cd7c988b1.

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