Update API test for addition of @unsafe

Author: DougGregor

test/api-digester/Outputs/stability-stdlib-source-x86_64.swift.expected

@@ -345,3 +345,18 @@ Func UnsafePointer.withMemoryRebound(to:capacity:_:) has generic signature chang
 Func UnsafePointer.withMemoryRebound(to:capacity:_:) is now without @rethrows
 Func withExtendedLifetime(_:_:) has generic signature change from <T, Result> to <T, E, Result where E : Swift.Error, T : ~Copyable, Result : ~Copyable>
 Func withExtendedLifetime(_:_:) is now without @rethrows
+
+// Adoption of @unsafe
+Func unsafeBitCast(_:to:) is now with @unsafe
+Func unsafeDowncast(_:to:) is now with @unsafe
+Struct OpaquePointer is now with @unsafe
+Struct Unmanaged is now with @unsafe
+Struct UnsafeBufferPointer is now with @unsafe
+Struct UnsafeMutableBufferPointer is now with @unsafe
+Struct UnsafeMutablePointer is now with @unsafe
+Struct UnsafeMutableRawBufferPointer is now with @unsafe
+Struct UnsafeMutableRawPointer is now with @unsafe
+Struct UnsafePointer is now with @unsafe
+Struct UnsafeRawBufferPointer is now with @unsafe
+Struct UnsafeRawPointer is now with @unsafe
+Var Optional.unsafelyUnwrapped is now with @unsafe