Fixes swiftlang#4735. Xcode 14 introduced the `NSLocking.withLock(_:)` method to the Darwin implementation of Foundation. This commit adds the new method to the open-source implementation. (Note: The [documentation](https://developer.apple.com/documentation/foundation/nslocking/4059821-withlock) incorrectly specifies the availability of the method as iOS 16+, etc. but it is actually available on all OS versions because it is marked [`@_alwaysEmitIntoClient`](https://github.com/apple/swift/blob/main/docs/ReferenceGuides/UnderscoredAttributes.md#_alwaysemitintoclient). The documentation bug is tracked by [FB11968310](https://feedbackassistant.apple.com/feedback/11968310).) I copied the implementation from `Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/System/Library/Frameworks/Foundation.framework/Modules/Foundation.swiftmodule/arm64e-apple-ios.swiftinterface`.

Add `NSLock.withLock(_:)` method#4736parkera merged 1 commit intoswiftlang:mainswiftlang/swift-corelibs-foundation:mainfrom fumoboy007:mainfumoboy007/swift-corelibs-foundation:mainCopy head branch name to clipboard

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