Avoid one repeated property lookup when computing store ICs.

src/stub-cache.cc

Index: src/stub-cache.cc
diff --git a/src/stub-cache.cc b/src/stub-cache.cc
index 4a7a7a69a0802f1c105818029846144fec3d1e11..620060533152c8e526025adb8649143e1d0ff134 100644
--- a/src/stub-cache.cc
+++ b/src/stub-cache.cc
@@ -614,14 +614,18 @@ RUNTIME_FUNCTION(StorePropertyWithInterceptor) {
   Handle<Name> name = args.at<Name>(1);
   Handle<Object> value = args.at<Object>(2);
 #ifdef DEBUG
-  if (receiver->IsJSGlobalProxy()) {
-    PrototypeIterator iter(isolate, receiver);
-    DCHECK(iter.IsAtEnd() ||
-           Handle<JSGlobalObject>::cast(PrototypeIterator::GetCurrent(iter))
-               ->HasNamedInterceptor());
-  } else {
-    DCHECK(receiver->HasNamedInterceptor());
+  PrototypeIterator iter(isolate, receiver,
+                         PrototypeIterator::START_AT_RECEIVER);
+  bool found = false;
+  while (!iter.IsAtEnd(PrototypeIterator::END_AT_NON_HIDDEN)) {
+    Handle<Object> current = PrototypeIterator::GetCurrent(iter);
+    if (current->IsJSObject() &&
+        Handle<JSObject>::cast(current)->HasNamedInterceptor()) {
+      found = true;
+      break;
+    }
   }
+  DCHECK(found);
 #endif
   Handle<Object> result;
   ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
@@ -1007,8 +1011,8 @@ Handle<Code> NamedStoreHandlerCompiler::CompileStoreTransition(
 }
 
 
-Handle<Code> NamedStoreHandlerCompiler::CompileStoreField(LookupResult* lookup,
-                                                          Handle<Name> name) {
+Handle<Code> NamedStoreHandlerCompiler::CompileStoreField(
+    LookupIterator* lookup, Handle<Name> name) {
   Label miss;
   GenerateStoreField(lookup, value(), &miss);
   __ bind(&miss);