WIP: Implement ES6 Spread-calls

src/ic/ic-state.h

Index: src/ic/ic-state.h
diff --git a/src/ic/ic-state.h b/src/ic/ic-state.h
index b5f58ed211a1800ede1b7c6022409cfa04669797..f34b65f857deb6089a2d20cf21baaae950d45491 100644
--- a/src/ic/ic-state.h
+++ b/src/ic/ic-state.h
@@ -28,8 +28,8 @@ class CallICState FINAL BASE_EMBEDDED {
 
   enum CallType { METHOD, FUNCTION };
 
-  CallICState(int argc, CallType call_type)
-      : argc_(argc), call_type_(call_type) {}
+  CallICState(int argc, CallType call_type, bool is_spread = false)
+      : argc_(argc), call_type_(call_type), is_spread_(is_spread) {}
 
   ExtraICState GetExtraICState() const;
 
@@ -39,15 +39,18 @@ class CallICState FINAL BASE_EMBEDDED {
 
   int arg_count() const { return argc_; }
   CallType call_type() const { return call_type_; }
+  bool is_spread() const { return is_spread_; }
 
   bool CallAsMethod() const { return call_type_ == METHOD; }
 
  private:
   class ArgcBits : public BitField<int, 0, Code::kArgumentsBits> {};
   class CallTypeBits : public BitField<CallType, Code::kArgumentsBits, 1> {};
+  class IsSpreadBits : public BitField<bool, CallTypeBits::kNext, 1> {};
 
   const int argc_;
   const CallType call_type_;
+  const bool is_spread_;
 };