NIOThrowingAsyncSequenceProducer make more funcs @inlinable (#3243)

When working on performance in PostgresNIO I noticed a few
`_swift_getGenericMetadata`s. We don't like those. I could trace them
down to `NIOThrowingAsyncSequenceProducer`. All methods on this object
are generic, since the object itself is generic.

Co-authored-by: George Barnett <[email protected]>

Author: fabianfett

Sources/NIOCore/AsyncSequences/NIOThrowingAsyncSequenceProducer.swift

@@ -48,7 +48,7 @@ public struct NIOThrowingAsyncSequenceProducer<
         /// The actual sequence which should be passed to the consumer.
         public let sequence: NIOThrowingAsyncSequenceProducer
 
-        @usableFromInline
+        @inlinable
         internal init(
             source: Source,
             sequence: NIOThrowingAsyncSequenceProducer
@@ -218,6 +218,7 @@ public struct NIOThrowingAsyncSequenceProducer<
 
 @available(macOS 10.15, iOS 13, tvOS 13, watchOS 6, *)
 extension NIOThrowingAsyncSequenceProducer: AsyncSequence {
+    @inlinable
     public func makeAsyncIterator() -> AsyncIterator {
         AsyncIterator(storage: self._internalClass._storage)
     }
@@ -234,7 +235,8 @@ extension NIOThrowingAsyncSequenceProducer {
             @usableFromInline
             internal let _storage: Storage
 
-            fileprivate init(storage: Storage) {
+            @inlinable
+            init(storage: Storage) {
                 self._storage = storage
                 self._storage.iteratorInitialized()
             }
@@ -253,7 +255,8 @@ extension NIOThrowingAsyncSequenceProducer {
         @usableFromInline
         internal let _internalClass: InternalClass
 
-        fileprivate init(storage: Storage) {
+        @inlinable
+        init(storage: Storage) {
             self._internalClass = InternalClass(storage: storage)
         }
 
@@ -309,7 +312,7 @@ extension NIOThrowingAsyncSequenceProducer {
             self._internalClass._storage
         }
 
-        @usableFromInline
+        @inlinable
         internal init(storage: Storage, finishOnDeinit: Bool) {
             self._internalClass = .init(storage: storage, finishOnDeinit: finishOnDeinit)
         }
@@ -422,7 +425,7 @@ extension NIOThrowingAsyncSequenceProducer {
         @usableFromInline
         internal let _state: NIOLockedValueBox<State>
 
-        @usableFromInline
+        @inlinable
         internal func _setDidSuspend(_ didSuspend: (@Sendable () -> Void)?) {
             self._state.withLockedValue {
                 $0.didSuspend = didSuspend
@@ -434,7 +437,7 @@ extension NIOThrowingAsyncSequenceProducer {
             self._state.withLockedValue { $0.stateMachine.isFinished }
         }
 
-        @usableFromInline
+        @inlinable
         internal init(
             backPressureStrategy: Strategy,
             delegate: Delegate
@@ -928,7 +931,7 @@ extension NIOThrowingAsyncSequenceProducer {
             /// Indicates that the yielded elements have been dropped.
             case returnDropped
 
-            @usableFromInline
+            @inlinable
             init(
                 shouldProduceMore: Bool,
                 continuationAndElement: (CheckedContinuation<Element?, Error>, Element)? = nil