Support pass-through of stub caller arguments

src/hydrogen-instructions.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 3992 matching lines @@
 
   DECLARE_CONCRETE_INSTRUCTION(OsrEntry)
 
  private:
   BailoutId ast_id_;
 };
 
 
 class HParameter: public HTemplateInstruction<0> {
  public:
-  explicit HParameter(unsigned index) : index_(index) {
+  enum ParameterKind {
+    STACK_PARAMETER,
+    REGISTER_PARAMETER
+  };
+
+  explicit HParameter(unsigned index,
+                      ParameterKind kind = STACK_PARAMETER)
+      : index_(index),
+        kind_(kind) {
     set_representation(Representation::Tagged());
   }
 
   unsigned index() const { return index_; }
+  ParameterKind kind() const { return kind_; }
 
   virtual void PrintDataTo(StringStream* stream);
 
   virtual Representation RequiredInputRepresentation(int index) {
     return Representation::None();
   }
 
   DECLARE_CONCRETE_INSTRUCTION(Parameter)
 
  private:
   unsigned index_;
+  ParameterKind kind_;
 };
 
 
 class HCallStub: public HUnaryCall {
  public:
   HCallStub(HValue* context, CodeStub::Major major_key, int argument_count)
       : HUnaryCall(context, argument_count),
         major_key_(major_key),
         transcendental_type_(TranscendentalCache::kNumberOfCaches) {
   }
@@ skipping 1694 matching lines @@
   virtual bool IsDeletable() const { return true; }
 };
 
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_INSTRUCTIONS_H_