Merge pull request #30944 from DougGregor/import-module-for-empty-extensions

Revert "[PrintAsObjC] Don't include the module for empty extensions"

Author: DougGregor

lib/PrintAsObjC/ModuleContentsWriter.cpp

@@ -400,9 +400,6 @@ class ModuleWriter {
   }
 
   bool writeExtension(const ExtensionDecl *ED) {
-    if (printer.isEmptyExtensionDecl(ED))
-      return true;
-
     bool allRequirementsSatisfied = true;
 
     const ClassDecl *CD = ED->getSelfClassDecl();

test/PrintAsObjC/Inputs/custom-modules/MiserablePileOfSecrets.h

@@ -3,6 +3,3 @@
 @interface NSObject (Secrets)
 - (void)secretMethod;
 @end
-
-@interface SecretClass : NSObject
-@end

test/PrintAsObjC/imports.swift

@@ -67,7 +67,3 @@ import MostlyPrivate2_Private
 @objc public class TestSubclass: NSObject {
   @_implementationOnly public override func secretMethod() {}
 }
-
-extension SecretClass {
-  private func somethingThatShouldNotBeIncluded() {}
-}