Revert "ES6: Add support for Map/Set forEach"

src/x64/full-codegen-x64.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2238 matching lines @@
 
   __ bind(&done);
   context()->Plug(result_register());
 }
 
 
 void FullCodeGenerator::EmitCreateIteratorResult(bool done) {
   Label gc_required;
   Label allocated;
 
-  Handle<Map> map(isolate()->native_context()->iterator_result_map());
+  Handle<Map> map(isolate()->native_context()->generator_result_map());
 
   __ Allocate(map->instance_size(), rax, rcx, rdx, &gc_required, TAG_OBJECT);
   __ jmp(&allocated);
 
   __ bind(&gc_required);
   __ Push(Smi::FromInt(map->instance_size()));
   __ CallRuntime(Runtime::kHiddenAllocateInNewSpace, 1);
   __ movp(context_register(),
           Operand(rbp, StandardFrameConstants::kContextOffset));
 
@@ skipping 2647 matching lines @@
   ASSERT_EQ(isolate->builtins()->OsrAfterStackCheck()->entry(),
             Assembler::target_address_at(call_target_address,
                                          unoptimized_code));
   return OSR_AFTER_STACK_CHECK;
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64