Fix crash bug in Hydrogen occurring with empty prototype chain.

src/hydrogen.cc

Index: src/hydrogen.cc
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index 9ef4b5d6d9352e22b4f954bcb58af0d825d4666f..4459db8107b849ce41faa5f3e239a80372493156 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -4951,7 +4951,7 @@ HInstruction* HGraphBuilder::BuildStoreNamedField(HValue* object,
   // If the property does not exist yet, we have to check that it wasn't made
   // readonly or turned into a setter by some meanwhile modifications on the
   // prototype chain.
-  if (!lookup->IsProperty()) {
+  if (!lookup->IsProperty() && type->prototype()->IsJSReceiver()) {
     Object* proto = type->prototype();
     // First check that the prototype chain isn't affected already.
     LookupResult proto_result(isolate());