Use withUnsafePointer(to:) rather than withUnsafeBytes(of:)

Author: DougGregor

stdlib/public/Concurrency/TaskGroup.swift

@@ -218,10 +218,10 @@ public struct TaskGroup<ChildTaskResult> {
     flags.addPendingGroupTaskUnconditionally = true
 
     var groupOption = TaskOptionRecord.TaskGroup(group: _group)
-    withUnsafeBytes(of: &groupOption) { optionsBuffer in
+    withUnsafePointer(to: &groupOption) { optionsPtr in
       // Create the asynchronous task future.
       _ = Builtin.createAsyncTask(
-          flags.bits, optionsBuffer.baseAddress?._rawValue, operation)
+          flags.bits, optionsPtr._rawValue, operation)
     }
   }
 
@@ -257,10 +257,10 @@ public struct TaskGroup<ChildTaskResult> {
     flags.enqueueJob = true
 
     var groupOption = TaskOptionRecord.TaskGroup(group: _group)
-    withUnsafeBytes(of: &groupOption) { optionsBuffer in
+    withUnsafePointer(to: &groupOption) { optionsPtr in
       // Create the asynchronous task future.
       _ = Builtin.createAsyncTask(
-          flags.bits, optionsBuffer.baseAddress?._rawValue, operation)
+          flags.bits, optionsPtr._rawValue, operation)
     }
 
     return true
@@ -447,10 +447,10 @@ public struct ThrowingTaskGroup<ChildTaskResult, Failure: Error> {
     flags.addPendingGroupTaskUnconditionally = true
 
     var groupOption = TaskOptionRecord.TaskGroup(group: _group)
-    withUnsafeBytes(of: &groupOption) { optionsBuffer in
+    withUnsafePointer(to: &groupOption) { optionsPtr in
       // Create the asynchronous task future.
       _ = Builtin.createAsyncTask(
-          flags.bits, optionsBuffer.baseAddress?._rawValue, operation)
+          flags.bits, optionsPtr._rawValue, operation)
     }
   }
 
@@ -486,10 +486,10 @@ public struct ThrowingTaskGroup<ChildTaskResult, Failure: Error> {
     flags.enqueueJob = true
 
     var groupOption = TaskOptionRecord.TaskGroup(group: _group)
-    withUnsafeBytes(of: &groupOption) { optionsBuffer in
+    withUnsafePointer(to: &groupOption) { optionsPtr in
       // Create the asynchronous task future.
       _ = Builtin.createAsyncTask(
-          flags.bits, optionsBuffer.baseAddress?._rawValue, operation)
+          flags.bits, optionsPtr._rawValue, operation)
     }
 
     return true