[Concurrency] latest cancellation handler is emit into client; no ABI entry

Author: ktoso

stdlib/public/Concurrency/TaskCancellation.swift

@@ -85,9 +85,6 @@ public func withTaskCancellationHandler<T>(
 // with the operation closure. Instead, we should do what the docs of this method promise - and not hop at all,
 // by using the new nonisolated(nonsending)
 @available(SwiftStdlib 5.1, *)
-//#if !$Embedded
-//@backDeployed(before: SwiftStdlib 6.0)
-//#endif
 @_silgen_name("$ss27withTaskCancellationHandler9operation8onCancel9isolationxxyYaKXE_yyYbXEScA_pSgYitYaKlF")
 public func _isolatedParam_withTaskCancellationHandler<T>(
   operation: () async throws -> T,

test/abi/macOS/arm64/concurrency.swift

@@ -320,9 +320,6 @@ Added: _$sScf13checkIsolatedyyFTq
 // withTaskCancellationHandler gains #isolated
 Added: _$ss27withTaskCancellationHandler9operation8onCancel9isolationxxyYaKXE_yyYbXEScA_pSgYitYaKlF
 Added: _$ss27withTaskCancellationHandler9operation8onCancel9isolationxxyYaKXE_yyYbXEScA_pSgYitYaKlFTu
-// withTaskCancellationHandler but with caller execution
-// Swift.withTaskCancellationHandler<A>(operation: nonisolated(nonsending) () async throws -> A, onCancel: @Sendable () -> ()) async throws -> A
-// async function pointer to Swift.withTaskCancellationHandler<A>(operation: nonisolated(nonsending) () async throws -> A, onCancel: @Sendable () -> ()) async throws -> A
 Added: _$ss27withTaskCancellationHandler9operation8onCancelxxyYaKYCXE_yyYbXEtYaKlF
 Added: _$ss27withTaskCancellationHandler9operation8onCancelxxyYaKYCXE_yyYbXEtYaKlFTu
 

test/abi/macOS/x86_64/concurrency.swift

@@ -320,9 +320,6 @@ Added: _$sScf13checkIsolatedyyFTq
 // withTaskCancellationHandler gains #isolated
 Added: _$ss27withTaskCancellationHandler9operation8onCancel9isolationxxyYaKXE_yyYbXEScA_pSgYitYaKlF
 Added: _$ss27withTaskCancellationHandler9operation8onCancel9isolationxxyYaKXE_yyYbXEScA_pSgYitYaKlFTu
-// withTaskCancellationHandler but with caller execution
-// Swift.withTaskCancellationHandler<A>(operation: nonisolated(nonsending) () async throws -> A, onCancel: @Sendable () -> ()) async throws -> A
-// async function pointer to Swift.withTaskCancellationHandler<A>(operation: nonisolated(nonsending) () async throws -> A, onCancel: @Sendable () -> ()) async throws -> A
 Added: _$ss27withTaskCancellationHandler9operation8onCancelxxyYaKYCXE_yyYbXEtYaKlF
 Added: _$ss27withTaskCancellationHandler9operation8onCancelxxyYaKYCXE_yyYbXEtYaKlFTu