Fix keyed access of primitive objects in the runtime.

src/lookup.h

Index: src/lookup.h
diff --git a/src/lookup.h b/src/lookup.h
index 2fcf46429d6ddb41a500003f2fa3902333b5db3c..29c592214f66979ac8441eb32538d738fe74d747 100644
--- a/src/lookup.h
+++ b/src/lookup.h
@@ -56,7 +56,7 @@ class LookupIterator final BASE_EMBEDDED {
         // kMaxUInt32 isn't a valid index.
         index_(kMaxUInt32),
         receiver_(receiver),
-        holder_(GetRoot(receiver_, isolate_)),
+        holder_(GetRoot()),
         holder_map_(holder_->map(), isolate_),
         initial_holder_(holder_),
         number_(DescriptorArray::kNotFound) {
@@ -102,7 +102,7 @@ class LookupIterator final BASE_EMBEDDED {
         name_(),
         index_(index),
         receiver_(receiver),
-        holder_(GetRoot(receiver_, isolate_)),
+        holder_(GetRoot()),
         holder_map_(holder_->map(), isolate_),
         initial_holder_(holder_),
         number_(DescriptorArray::kNotFound) {
@@ -196,7 +196,7 @@ class LookupIterator final BASE_EMBEDDED {
     DCHECK(IsFound());
     return Handle<T>::cast(holder_);
   }
-  static Handle<JSReceiver> GetRoot(Handle<Object> receiver, Isolate* isolate);
+  Handle<JSReceiver> GetRoot();
   bool HolderIsReceiverOrHiddenPrototype() const;
 
   /* ACCESS_CHECK */