stdlib: Address StrictMemorySafety warnings in Concurrency related code.

Author: tshortli

stdlib/public/Concurrency/AsyncStreamBuffer.swift

@@ -252,7 +252,7 @@ extension AsyncStream {
     func next() async -> Element? {
       await withTaskCancellationHandler {
         unsafe await withUnsafeContinuation {
-          next($0)
+          unsafe next($0)
         }
       } onCancel: { [cancel] in
         cancel()
@@ -512,7 +512,7 @@ extension AsyncThrowingStream {
     func next() async throws -> Element? {
       try await withTaskCancellationHandler {
         try unsafe await withUnsafeThrowingContinuation {
-          next($0)
+          unsafe next($0)
         }
       } onCancel: { [cancel] in
         cancel()

stdlib/public/Concurrency/Deque/Deque+Collection.swift

@@ -93,7 +93,7 @@ extension _Deque: Sequence {
   }
 
   __consuming func _copyToContiguousArray() -> ContiguousArray<Element> {
-    ContiguousArray(unsafeUninitializedCapacity: _storage.count) { target, count in
+    unsafe ContiguousArray(unsafeUninitializedCapacity: _storage.count) { target, count in
       unsafe _storage.read { source in
         let segments = unsafe source.segments()
         let c = unsafe segments.first.count

stdlib/public/Concurrency/Deque/Deque+Testing.swift

@@ -62,7 +62,7 @@ extension _Deque {
     }
     let storage = unsafe _Deque<Element>._Storage(unsafeDowncast(buffer, to: _DequeBuffer.self))
     if contents.count > 0 {
-      contents.withUnsafeBufferPointer { source in
+      unsafe contents.withUnsafeBufferPointer { source in
         unsafe storage.update { target in
           let segments = unsafe target.mutableSegments()
           let c = unsafe segments.first.count

stdlib/public/Concurrency/Task+startSynchronously.swift.gyb

@@ -76,7 +76,7 @@ extension Task where Failure == ${FAILURE_TYPE} {
     #if $BuiltinCreateAsyncTaskName
     if let name {
       task =
-        name.utf8CString.withUnsafeBufferPointer { nameBytes in
+        unsafe name.utf8CString.withUnsafeBufferPointer { nameBytes in
           Builtin.createTask(
             flags: flags,
             taskName: nameBytes.baseAddress!._rawValue,

stdlib/public/Concurrency/Task.swift

@@ -731,7 +731,7 @@ extension Task where Failure == Never {
     #if $BuiltinCreateAsyncTaskName
     if let name {
       task =
-        name.utf8CString.withUnsafeBufferPointer { nameBytes in
+        unsafe name.utf8CString.withUnsafeBufferPointer { nameBytes in
           Builtin.createTask(
             flags: flags,
             initialSerialExecutor: builtinSerialExecutor,
@@ -900,7 +900,7 @@ self._task = task
   #if $BuiltinCreateAsyncTaskName
   if let name {
     task =
-      name.utf8CString.withUnsafeBufferPointer { nameBytes in
+      unsafe name.utf8CString.withUnsafeBufferPointer { nameBytes in
         Builtin.createTask(
           flags: flags,
           initialSerialExecutor: builtinSerialExecutor,
@@ -1041,7 +1041,7 @@ extension Task where Failure == Never {
     #if $BuiltinCreateAsyncTaskName
     if let name {
       task =
-        name.utf8CString.withUnsafeBufferPointer { nameBytes in
+        unsafe name.utf8CString.withUnsafeBufferPointer { nameBytes in
           Builtin.createTask(
             flags: flags,
             initialSerialExecutor: builtinSerialExecutor,
@@ -1183,7 +1183,7 @@ extension Task where Failure == Error {
     #if $BuiltinCreateAsyncTaskName
     if let name {
       task =
-        name.utf8CString.withUnsafeBufferPointer { nameBytes in
+        unsafe name.utf8CString.withUnsafeBufferPointer { nameBytes in
           Builtin.createTask(
             flags: flags,
             initialSerialExecutor: builtinSerialExecutor,

stdlib/public/Concurrency/TaskGroup+addTask.swift.gyb

@@ -262,7 +262,7 @@ extension ${TYPE} {
     #if $BuiltinCreateAsyncTaskName
     if let name {
       task =
-        name.utf8CString.withUnsafeBufferPointer { nameBytes in
+        unsafe name.utf8CString.withUnsafeBufferPointer { nameBytes in
           ${TASK_CREATE_FN}(
             flags: flags,
             initialSerialExecutor: builtinSerialExecutor,

stdlib/public/Synchronization/Atomics/AtomicLazyReference.swift

@@ -25,7 +25,7 @@ public struct AtomicLazyReference<Instance: AnyObject>: ~Copyable {
   @available(SwiftStdlib 6.0, *)
   @inlinable
   public init() {
-    storage = unsafe Atomic<Unmanaged<Instance>?>(nil)
+    unsafe storage = Atomic<Unmanaged<Instance>?>(nil)
   }
 
   @inlinable