A64: Synchronize with r18642.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 23cd6d91752d1f6e360215b16e88e395f31f6571..7e7a3c0f59135be8edae8a335d7afedf4f97a774 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -10311,11 +10311,15 @@ void Code::InvalidateRelocation() {
 
 void Code::InvalidateEmbeddedObjects() {
   Object* undefined = GetHeap()->undefined_value();
-  int mode_mask = RelocInfo::ModeMask(RelocInfo::EMBEDDED_OBJECT);
+  Cell* undefined_cell = GetHeap()->undefined_cell();
+  int mode_mask = RelocInfo::ModeMask(RelocInfo::EMBEDDED_OBJECT) |
+                  RelocInfo::ModeMask(RelocInfo::CELL);
   for (RelocIterator it(this, mode_mask); !it.done(); it.next()) {
     RelocInfo::Mode mode = it.rinfo()->rmode();
     if (mode == RelocInfo::EMBEDDED_OBJECT) {
       it.rinfo()->set_target_object(undefined, SKIP_WRITE_BARRIER);
+    } else if (mode == RelocInfo::CELL) {
+      it.rinfo()->set_target_cell(undefined_cell, SKIP_WRITE_BARRIER);
     }
   }
 }
@@ -11277,7 +11281,8 @@ bool Code::IsWeakEmbeddedObject(Kind kind, Object* object) {
            FLAG_weak_embedded_maps_in_optimized_code;
   }
 
-  if (object->IsJSObject()) {
+  if (object->IsJSObject() ||
+      (object->IsCell() && Cell::cast(object)->value()->IsJSObject())) {
     return FLAG_weak_embedded_objects_in_optimized_code;
   }
 
@@ -11750,7 +11755,7 @@ bool DependentCode::Contains(DependencyGroup group, Code* code) {
 }
 
 
-void DependentCode::DeoptimizeDependentCodeGroup(
+bool DependentCode::MarkCodeForDeoptimization(
     Isolate* isolate,
     DependentCode::DependencyGroup group) {
   ASSERT(AllowCodeDependencyChange::IsAllowed());
@@ -11759,7 +11764,7 @@ void DependentCode::DeoptimizeDependentCodeGroup(
   int start = starts.at(group);
   int end = starts.at(group + 1);
   int code_entries = starts.number_of_entries();
-  if (start == end) return;
+  if (start == end) return false;
 
   // Mark all the code that needs to be deoptimized.
   bool marked = false;
@@ -11785,6 +11790,16 @@ void DependentCode::DeoptimizeDependentCodeGroup(
     clear_at(i);
   }
   set_number_of_entries(group, 0);
+  return marked;
+}
+
+
+void DependentCode::DeoptimizeDependentCodeGroup(
+    Isolate* isolate,
+    DependentCode::DependencyGroup group) {
+  ASSERT(AllowCodeDependencyChange::IsAllowed());
+  DisallowHeapAllocation no_allocation_scope;
+  bool marked = MarkCodeForDeoptimization(isolate, group);
 
   if (marked) Deoptimizer::DeoptimizeMarkedCode(isolate);
 }
@@ -12760,9 +12775,6 @@ const double AllocationSite::kPretenureRatio = 0.60;
 
 
 void AllocationSite::ResetPretenureDecision() {
-  dependent_code()->DeoptimizeDependentCodeGroup(
-      GetIsolate(),
-      DependentCode::kAllocationSiteTenuringChangedGroup);
   set_pretenure_decision(kUndecided);
   set_memento_found_count(0);
   set_memento_create_count(0);