Issue Description:

When a Swift class conforms to an Objective-C protocol that has a method that is both passed a block and “throws” (BOOL and NSError out pointer), the types on that method’s parameter list go out of order. For instance, the method:

- (BOOL) testBlock: (BOOL (^)(void))block error: (NSError**)error;

is turned into (from the Swift generated header):

- (BOOL)testBlock:(NSError * _Nullable * _Nullable)error error:(BOOL (^ _Nonnull)(void))block;

Results:
When importing Swift generated headers into Obj-C, calling the method on a variable of the class type will result in a compiler error. Calling the method on a variable of the protocol type will crash at runtime.

// BlockTestProtocol.h
#import <Foundation/Foundation.h>

NS_ASSUME_NONNULL_BEGIN

@protocol BlockTestProtocol <NSObject>

- (BOOL) testBlock: (NS_NOESCAPE BOOL (^)(void))block error: (NSError**)error;

@end

NS_ASSUME_NONNULL_END

import Foundation

class SwiftDelegate: NSObject, BlockTestProtocol {

    func test(_ block: () -> Bool) throws {
        print(block())
    }

}