Merge pull request #41689 from apple/revert-40661-ewilde/concurrency/cleanup-run-async-main

Author: hamishknight

include/swift/AST/Attr.def

@@ -695,7 +695,7 @@ SIMPLE_DECL_ATTR(_noAllocation, NoAllocation,
 SIMPLE_DECL_ATTR(preconcurrency, Preconcurrency,
   OnFunc | OnConstructor | OnProtocol | OnGenericType | OnVar | OnSubscript |
   OnEnumElement | OnImport |
-  ABIStableToAdd | ABIBreakingToRemove | APIStableToAdd | APIBreakingToRemove,
+  ABIBreakingToAdd | ABIBreakingToRemove | APIBreakingToAdd | APIBreakingToRemove,
   125)
 
 CONTEXTUAL_SIMPLE_DECL_ATTR(_const, CompileTimeConst,

stdlib/public/Concurrency/Task.swift

@@ -834,9 +834,7 @@ internal func _asyncMainDrainQueue() -> Never
 internal func _getMainExecutor() -> Builtin.Executor
 
 @available(SwiftStdlib 5.1, *)
-@usableFromInline
-@_predatesConcurrency
-internal func _runAsyncMain(_ asyncFun: @Sendable @escaping () async throws -> ()) {
+public func _runAsyncMain(_ asyncFun: @escaping () async throws -> ()) {
   Task.detached {
     do {
 #if !os(Windows)