Make cells pointing to JSObjects weak in optimized code.

src/lithium-codegen.cc

Index: src/lithium-codegen.cc
diff --git a/src/lithium-codegen.cc b/src/lithium-codegen.cc
index 84e95888ea86fd5d6d94029f6ebf716d16062123..162aca6eaa90210047ccb60302f351ae404da5bf 100644
--- a/src/lithium-codegen.cc
+++ b/src/lithium-codegen.cc
@@ -150,9 +150,17 @@ int LCodeGenBase::GetNextEmittedBlock() const {
 void LCodeGenBase::RegisterDependentCodeForEmbeddedMaps(Handle<Code> code) {
   ZoneList<Handle<Map> > maps(1, zone());
   ZoneList<Handle<JSObject> > objects(1, zone());
-  int mode_mask = RelocInfo::ModeMask(RelocInfo::EMBEDDED_OBJECT);
+  ZoneList<Handle<Cell> > cells(1, zone());
+  int mode_mask = RelocInfo::ModeMask(RelocInfo::EMBEDDED_OBJECT) |
+                  RelocInfo::ModeMask(RelocInfo::CELL);
   for (RelocIterator it(*code, mode_mask); !it.done(); it.next()) {
-    if (Code::IsWeakEmbeddedObject(code->kind(), it.rinfo()->target_object())) {
+    RelocInfo::Mode mode = it.rinfo()->rmode();
+    if (mode == RelocInfo::CELL &&
+        Code::IsWeakEmbeddedObject(code->kind(), it.rinfo()->target_cell())) {
+      Handle<Cell> cell(it.rinfo()->target_cell());
+      cells.Add(cell, zone());
+    } else if (mode == RelocInfo::EMBEDDED_OBJECT &&
+        Code::IsWeakEmbeddedObject(code->kind(), it.rinfo()->target_object())) {
       if (it.rinfo()->target_object()->IsMap()) {
         Handle<Map> map(Map::cast(it.rinfo()->target_object()));
         maps.Add(map, zone());
@@ -174,6 +182,9 @@ void LCodeGenBase::RegisterDependentCodeForEmbeddedMaps(Handle<Code> code) {
   for (int i = 0; i < objects.length(); i++) {
     AddWeakObjectToCodeDependency(isolate()->heap(), objects.at(i), code);
   }
+  for (int i = 0; i < cells.length(); i++) {
+    AddWeakObjectToCodeDependency(isolate()->heap(), cells.at(i), code);
+  }
 }