Call JS functions via native context instead of js builtins object.

src/ast.h

Index: src/ast.h
diff --git a/src/ast.h b/src/ast.h
index 1366041387215bc4c018c4b1650d39ff5f6549c4..86ffab20c7b522f671a22630e95945c9765b4720 100644
--- a/src/ast.h
+++ b/src/ast.h
@@ -2031,51 +2031,41 @@ class CallRuntime final : public Expression {
  public:
   DECLARE_NODE_TYPE(CallRuntime)
 
-  Handle<String> name() const { return raw_name_->string(); }
-  const AstRawString* raw_name() const { return raw_name_; }
-  const Runtime::Function* function() const { return function_; }
   ZoneList<Expression*>* arguments() const { return arguments_; }
   bool is_jsruntime() const { return function_ == NULL; }
 
-  // Type feedback information.
-  bool HasCallRuntimeFeedbackSlot() const { return is_jsruntime(); }
-  virtual FeedbackVectorRequirements ComputeFeedbackRequirements(
-      Isolate* isolate, const ICSlotCache* cache) override {
-    return FeedbackVectorRequirements(0, HasCallRuntimeFeedbackSlot() ? 1 : 0);
+  int context_index() const {
+    DCHECK(is_jsruntime());
+    return context_index_;
   }
-  void SetFirstFeedbackICSlot(FeedbackVectorICSlot slot,
-                              ICSlotCache* cache) override {
-    callruntime_feedback_slot_ = slot;
-  }
-  Code::Kind FeedbackICSlotKind(int index) override { return Code::LOAD_IC; }
-
-  FeedbackVectorICSlot CallRuntimeFeedbackSlot() {
-    DCHECK(!HasCallRuntimeFeedbackSlot() ||
-           !callruntime_feedback_slot_.IsInvalid());
-    return callruntime_feedback_slot_;
+  const Runtime::Function* function() const {
+    DCHECK(!is_jsruntime());
+    return function_;
   }
 
   static int num_ids() { return parent_num_ids() + 1; }
   BailoutId CallId() { return BailoutId(local_id(0)); }
 
  protected:
-  CallRuntime(Zone* zone, const AstRawString* name,
-              const Runtime::Function* function,
+  CallRuntime(Zone* zone, const Runtime::Function* function,
               ZoneList<Expression*>* arguments, int pos)
+      : Expression(zone, pos), function_(function), arguments_(arguments) {}
+
+  CallRuntime(Zone* zone, int context_index, ZoneList<Expression*>* arguments,
+              int pos)
       : Expression(zone, pos),
-        raw_name_(name),
-        function_(function),
-        arguments_(arguments),
-        callruntime_feedback_slot_(FeedbackVectorICSlot::Invalid()) {}
+        function_(NULL),
+        context_index_(context_index),
+        arguments_(arguments) {}
+
   static int parent_num_ids() { return Expression::num_ids(); }
 
  private:
   int local_id(int n) const { return base_id() + parent_num_ids() + n; }
 
-  const AstRawString* raw_name_;
   const Runtime::Function* function_;
+  int context_index_;
   ZoneList<Expression*>* arguments_;
-  FeedbackVectorICSlot callruntime_feedback_slot_;
 };
 
 
@@ -3509,11 +3499,20 @@ class AstNodeFactory final BASE_EMBEDDED {
     return new (zone_) CallNew(zone_, expression, arguments, pos);
   }
 
-  CallRuntime* NewCallRuntime(const AstRawString* name,
-                              const Runtime::Function* function,
-                              ZoneList<Expression*>* arguments,
-                              int pos) {
-    return new (zone_) CallRuntime(zone_, name, function, arguments, pos);
+  CallRuntime* NewCallRuntime(Runtime::FunctionId id,
+                              ZoneList<Expression*>* arguments, int pos) {
+    return new (zone_)
+        CallRuntime(zone_, Runtime::FunctionForId(id), arguments, pos);
+  }
+
+  CallRuntime* NewCallRuntime(const Runtime::Function* function,
+                              ZoneList<Expression*>* arguments, int pos) {
+    return new (zone_) CallRuntime(zone_, function, arguments, pos);
+  }
+
+  CallRuntime* NewCallRuntime(int context_index,
+                              ZoneList<Expression*>* arguments, int pos) {
+    return new (zone_) CallRuntime(zone_, context_index, arguments, pos);
   }
 
   UnaryOperation* NewUnaryOperation(Token::Value op,