Re-land r25392 Use a stub in crankshaft for grow store arrays.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 96a1aa19c9adf0e90b6f97899203a16336f645cb..ec31b72bd4bc20dbbc2717de2a0dc2e98ec508dc 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -11267,10 +11267,8 @@ void Code::Disassemble(const char* name, std::ostream& os) {  // NOLINT
 #endif  // ENABLE_DISASSEMBLER
 
 
-Handle<FixedArray> JSObject::SetFastElementsCapacityAndLength(
-    Handle<JSObject> object,
-    int capacity,
-    int length,
+Handle<FixedArray> JSObject::SetFastElementsCapacity(
+    Handle<JSObject> object, int capacity,
     SetFastElementsCapacitySmiMode smi_mode) {
   // We should never end in here with a pixel or external array.
   DCHECK(!object->HasExternalArrayElements());
@@ -11322,6 +11320,15 @@ Handle<FixedArray> JSObject::SetFastElementsCapacityAndLength(
                             object->GetElementsKind(), new_elements);
   }
 
+  return new_elements;
+}
+
+
+Handle<FixedArray> JSObject::SetFastElementsCapacityAndLength(
+    Handle<JSObject> object, int capacity, int length,
+    SetFastElementsCapacitySmiMode smi_mode) {
+  Handle<FixedArray> new_elements =
+      SetFastElementsCapacity(object, capacity, smi_mode);
   if (object->IsJSArray()) {
     Handle<JSArray>::cast(object)->set_length(Smi::FromInt(length));
   }
@@ -11329,9 +11336,8 @@ Handle<FixedArray> JSObject::SetFastElementsCapacityAndLength(
 }
 
 
-void JSObject::SetFastDoubleElementsCapacityAndLength(Handle<JSObject> object,
-                                                      int capacity,
-                                                      int length) {
+Handle<FixedArrayBase> JSObject::SetFastDoubleElementsCapacity(
+    Handle<JSObject> object, int capacity) {
   // We should never end in here with a pixel or external array.
   DCHECK(!object->HasExternalArrayElements());
 
@@ -11361,9 +11367,18 @@ void JSObject::SetFastDoubleElementsCapacityAndLength(Handle<JSObject> object,
                             object->GetElementsKind(), elems);
   }
 
+  return elems;
+}
+
+
+Handle<FixedArrayBase> JSObject::SetFastDoubleElementsCapacityAndLength(
+    Handle<JSObject> object, int capacity, int length) {
+  Handle<FixedArrayBase> new_elements =
+      SetFastDoubleElementsCapacity(object, capacity);
   if (object->IsJSArray()) {
     Handle<JSArray>::cast(object)->set_length(Smi::FromInt(length));
   }
+  return new_elements;
 }
 
 
@@ -13288,9 +13303,8 @@ void JSObject::GetElementsCapacityAndUsage(int* capacity, int* used) {
 }
 
 
-bool JSObject::WouldConvertToSlowElements(Handle<Object> key) {
-  uint32_t index;
-  if (HasFastElements() && key->ToArrayIndex(&index)) {
+bool JSObject::WouldConvertToSlowElements(uint32_t index) {
+  if (HasFastElements()) {
     Handle<FixedArrayBase> backing_store(FixedArrayBase::cast(elements()));
     uint32_t capacity = static_cast<uint32_t>(backing_store->length());
     if (index >= capacity) {