[Serialization] Force destructor creation for imported class for SIB deserialization

lib/Serialization/Deserialization.cpp

@@ -1611,6 +1611,14 @@ ModuleFile::resolveCrossReference(ModuleID MID, uint32_t pathLen) {
                                            getXRefDeclNameForError());
       }
 
+      if (memberName.getKind() == DeclBaseName::Kind::Destructor) {
+        assert(isa<ClassDecl>(nominal));
+        // Force creation of an implicit destructor
+        auto CD = dyn_cast<ClassDecl>(nominal);
+        values.push_back(CD->getDestructor());
+        break;
+      }
+
       if (!privateDiscriminator.empty()) {
         ModuleDecl *searchModule = M;
         if (!searchModule)

test/Serialization/Inputs/objc-xref/module.modulemap

@@ -0,0 +1,4 @@
+module ObjCXRef {
+  header "objc_xref.h"
+  export *
+}

test/Serialization/Inputs/objc-xref/objc_xref.h

@@ -0,0 +1,2 @@
+@interface MyObject
+@end

test/Serialization/xref-deinit.swift

@@ -0,0 +1,9 @@
+// RUN: %empty-directory(%t)
+// RUN: %target-swift-frontend -emit-sib %s -o %t/xref-deinit.sib -I%t -I %S/Inputs/objc-xref
+// RUN: %target-swift-frontend -emit-sil %t/xref-deinit.sib -I%t -I %S/Inputs/objc-xref
+
+// REQUIRES: objc_interop
+
+import ObjCXRef
+
+public class Object: MyObject {}