[concurrency] Mark the global _emptyDequeStorage as nonisolated(unsafe).

gottesmm · gottesmm · commit 7e8daa80cdd7 · 2024-06-05T12:03:57.000-07:00
We just use it as a way to initialize values. We will always just read from it
and copy from it.
diff --git a/stdlib/public/Concurrency/Deque/_DequeBuffer.swift b/stdlib/public/Concurrency/Deque/_DequeBuffer.swift
@@ -41,7 +41,7 @@ extension _DequeBuffer: CustomStringConvertible {
 }
 
 /// The type-punned empty singleton storage instance.
-internal let _emptyDequeStorage = _DequeBuffer<Void>.create(
+nonisolated(unsafe) internal let _emptyDequeStorage = _DequeBuffer<Void>.create(
   minimumCapacity: 0,
   makingHeaderWith: { _ in
     _DequeBufferHeader(capacity: 0, count: 0, startSlot: .init(at: 0))

Original file line number	Diff line number	Diff line change
`@@ -41,7 +41,7 @@ extension _DequeBuffer: CustomStringConvertible {`
`41`	`41`	`}`
`42`	`42`
`43`	`43`	`/// The type-punned empty singleton storage instance.`
`44`		`-internal let _emptyDequeStorage = _DequeBuffer<Void>.create(`
	`44`	`+nonisolated(unsafe) internal let _emptyDequeStorage = _DequeBuffer<Void>.create(`
`45`	`45`	`minimumCapacity: 0,`
`46`	`46`	`makingHeaderWith: { _ in`
`47`	`47`	`_DequeBufferHeader(capacity: 0, count: 0, startSlot: .init(at: 0))`