Merge pull request #34721 from eeckstein/fix-cow-availability

Author: swift-ci

stdlib/public/core/Builtin.swift

@@ -346,10 +346,12 @@ internal func _class_getInstancePositiveExtentSize(_ theClass: AnyClass) -> Int
 }
 
 #if INTERNAL_CHECKS_ENABLED
+@available(macOS 9999, iOS 9999, watchOS 9999, tvOS 9999, *)
 @usableFromInline
 @_silgen_name("_swift_isImmutableCOWBuffer")
 internal func _swift_isImmutableCOWBuffer(_ object: AnyObject) -> Bool
 
+@available(macOS 9999, iOS 9999, watchOS 9999, tvOS 9999, *)
 @usableFromInline
 @_silgen_name("_swift_setImmutableCOWBuffer")
 internal func _swift_setImmutableCOWBuffer(_ object: AnyObject, _ immutable: Bool) -> Bool

test/api-digester/stability-stdlib-abi-with-asserts.test

@@ -44,5 +44,3 @@ Protocol _RuntimeFunctionCountersStats is a new API without @available attribute
 Struct _GlobalRuntimeFunctionCountersState is a new API without @available attribute
 Struct _ObjectRuntimeFunctionCountersState is a new API without @available attribute
 Struct _RuntimeFunctionCounters is a new API without @available attribute
-Func _swift_isImmutableCOWBuffer(_:) is a new API without @available attribute
-Func _swift_setImmutableCOWBuffer(_:_:) is a new API without @available attribute