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Summary:
I make a Swift class and uses alternative Obj name for it with @objc() attribute
When I make swift extension the Objc generated header uses Swift class name instead of alternative name for that extension.

Steps to Reproduce:
- Make a swift class with alternative name and expose it to Objc
- Make an extension 
- Try to use this class in Objc


Code:

@objc(KOKBird) public class Bird: NSObject {
  let name = "Swift"
}

public extension Bird {
  func fly() {
    print("I can Fly!!!")
  }
}

/// #import "ExtensionTest-Swift.h"

SWIFT_CLASS_NAMED("Bird")
@interface KOKBird : NSObject
@property (nonatomic, readonly, copy) NSString * __nonnull name;
- (nonnull instancetype)init OBJC_DESIGNATED_INITIALIZER;
@end


@interface Bird (SWIFT_EXTENSION(ExtensionTest)) // Wrong name Here!!! 
- (void)fly;
@end

Expected Results:
It should work and use an alternative name for extension when generating Objc header

Actual Results:
It can't compile

Notes:
- Example project is attached