Move (uppercase) JS builtins from js builtins object to native context.

src/compiler/ast-graph-builder.cc

Index: src/compiler/ast-graph-builder.cc
diff --git a/src/compiler/ast-graph-builder.cc b/src/compiler/ast-graph-builder.cc
index 88dc44e3427f89b3ae00d2a1b0f670ce05c4728e..12e121b5069474590509ccf22eea2773f1715fbd 100644
--- a/src/compiler/ast-graph-builder.cc
+++ b/src/compiler/ast-graph-builder.cc
@@ -1985,10 +1985,8 @@ void AstGraphBuilder::VisitArrayLiteral(ArrayLiteral* expr) {
     if (subexpr->IsSpread()) {
       VisitForValue(subexpr->AsSpread()->expression());
       Node* iterable = environment()->Pop();
-      Node* builtins = BuildLoadBuiltinsObject();
-      Node* function = BuildLoadObjectField(
-          builtins, JSBuiltinsObject::OffsetOfFunctionWithId(
-                        Builtins::CONCAT_ITERABLE_TO_ARRAY));
+      Node* function = BuildLoadNativeContextField(
+          Context::CONCAT_ITERABLE_TO_ARRAY_BUILTIN_INDEX);
       result = NewNode(javascript()->CallFunction(3, NO_CALL_FUNCTION_FLAGS,
                                                   language_mode()),
                        function, array, iterable);
@@ -2541,12 +2539,7 @@ void AstGraphBuilder::VisitCallJSRuntime(CallRuntime* expr) {
   // The callee and the receiver both have to be pushed onto the operand stack
   // before arguments are being evaluated.
   CallFunctionFlags flags = NO_CALL_FUNCTION_FLAGS;
-  Node* global = BuildLoadGlobalObject();
-  Node* native_context =
-      BuildLoadObjectField(global, GlobalObject::kNativeContextOffset);
-  Node* callee_value =
-      NewNode(javascript()->LoadContext(0, expr->context_index(), true),
-              native_context);
+  Node* callee_value = BuildLoadNativeContextField(expr->context_index());
   Node* receiver_value = jsgraph()->UndefinedConstant();
 
   environment()->Push(callee_value);
@@ -3759,6 +3752,14 @@ Node* AstGraphBuilder::BuildLoadGlobalObject() {
 }
 
 
+Node* AstGraphBuilder::BuildLoadNativeContextField(int index) {
+  Node* global = BuildLoadGlobalObject();
+  Node* native_context =
+      BuildLoadObjectField(global, GlobalObject::kNativeContextOffset);
+  return NewNode(javascript()->LoadContext(0, index, true), native_context);
+}
+
+
 Node* AstGraphBuilder::BuildLoadGlobalProxy() {
   Node* global = BuildLoadGlobalObject();
   Node* proxy =