Crankshaft support for polymorphic array handling

src/ast.cc

Index: src/ast.cc
diff --git a/src/ast.cc b/src/ast.cc
index 03df229963ec00771500449589e04640e657c2df..4580db5ca96f9523e8e25a14ea8ffa27fde39ba6 100644
--- a/src/ast.cc
+++ b/src/ast.cc
@@ -607,6 +607,9 @@ void Property::RecordTypeFeedback(TypeFeedbackOracle* oracle) {
     is_string_access_ = true;
   } else if (is_monomorphic_) {
     monomorphic_receiver_type_ = oracle->LoadMonomorphicReceiverType(this);
+  } else if (oracle->LoadIsMegamorphicWithTypeInfo(this)) {
+    receiver_types_ = new ZoneMapList(kMaxKeyedPolymorphism);
+    oracle->CollectKeyedReceiverTypes(this->id(), receiver_types_);
   }
 }
 
@@ -622,8 +625,11 @@ void Assignment::RecordTypeFeedback(TypeFeedbackOracle* oracle) {
     ZoneMapList* types = oracle->StoreReceiverTypes(this, name);
     receiver_types_ = types;
   } else if (is_monomorphic_) {
-    // Record receiver type for monomorphic keyed loads.
+    // Record receiver type for monomorphic keyed stores.
     monomorphic_receiver_type_ = oracle->StoreMonomorphicReceiverType(this);
+  } else if (oracle->StoreIsMegamorphicWithTypeInfo(this)) {
+    receiver_types_ = new ZoneMapList(kMaxKeyedPolymorphism);
+    oracle->CollectKeyedReceiverTypes(this->id(), receiver_types_);
   }
 }
 
@@ -631,8 +637,11 @@ void Assignment::RecordTypeFeedback(TypeFeedbackOracle* oracle) {
 void CountOperation::RecordTypeFeedback(TypeFeedbackOracle* oracle) {
   is_monomorphic_ = oracle->StoreIsMonomorphicNormal(this);
   if (is_monomorphic_) {
-    // Record receiver type for monomorphic keyed loads.
+    // Record receiver type for monomorphic keyed stores.
     monomorphic_receiver_type_ = oracle->StoreMonomorphicReceiverType(this);
+  } else if (oracle->StoreIsMegamorphicWithTypeInfo(this)) {
+    receiver_types_ = new ZoneMapList(kMaxKeyedPolymorphism);
+    oracle->CollectKeyedReceiverTypes(this->id(), receiver_types_);
   }
 }