[strong] class objects created in strong mode have their prototype frozen

src/arm64/full-codegen-arm64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
@@ skipping 2334 matching lines @@
       default:
         UNREACHABLE();
     }
   }
 
   // prototype
   __ CallRuntime(Runtime::kToFastProperties, 1);
 
   // constructor
   __ CallRuntime(Runtime::kToFastProperties, 1);
+
+  if (is_strong(language_mode())) {
+    __ Ldr(scratch,
+           FieldMemOperand(x0, JSFunction::kPrototypeOrInitialMapOffset));
+    __ push(x0);
+    __ Push(scratch);
+    // TODO(conradw): It would be more efficient to define the properties with
+    // the right attributes the first time round.
+    // Freeze the prototype.
+    __ CallRuntime(Runtime::kObjectFreeze, 1);
+    // Freeze the constructor.
+    __ CallRuntime(Runtime::kObjectFreeze, 1);
+  }
 }
 
 
 void FullCodeGenerator::EmitAssignment(Expression* expr,
                                        FeedbackVectorICSlot slot) {
   DCHECK(expr->IsValidReferenceExpression());
 
   Property* prop = expr->AsProperty();
   LhsKind assign_type = Property::GetAssignType(prop);
 
@@ skipping 3237 matching lines @@
   }
 
   return INTERRUPT;
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM64