Fix memory leak caused by treating Code::next_code_link as strong in marker.

src/objects-visiting-inl.h

Index: src/objects-visiting-inl.h
diff --git a/src/objects-visiting-inl.h b/src/objects-visiting-inl.h
index 010f3068a9e3ce1b7e493cb513e3c8df9fef3562..b4935fcb0837134574e53d8352f6457e6f552997 100644
--- a/src/objects-visiting-inl.h
+++ b/src/objects-visiting-inl.h
@@ -898,6 +898,7 @@ void Code::CodeIterateBody(ObjectVisitor* v) {
   IteratePointer(v, kHandlerTableOffset);
   IteratePointer(v, kDeoptimizationDataOffset);
   IteratePointer(v, kTypeFeedbackInfoOffset);
+  IterateNextCodeLink(v, kNextCodeLinkOffset);
   IteratePointer(v, kConstantPoolOffset);
 
   RelocIterator it(this, mode_mask);
@@ -932,6 +933,9 @@ void Code::CodeIterateBody(Heap* heap) {
   StaticVisitor::VisitPointer(
       heap,
       reinterpret_cast<Object**>(this->address() + kTypeFeedbackInfoOffset));
+  StaticVisitor::VisitNextCodeLink(
+      heap,
+      reinterpret_cast<Object**>(this->address() + kNextCodeLinkOffset));
   StaticVisitor::VisitPointer(
       heap,
       reinterpret_cast<Object**>(this->address() + kConstantPoolOffset));