Preview of a first step towards unification of hydrogen calls

src/code-stubs.h

Index: src/code-stubs.h
diff --git a/src/code-stubs.h b/src/code-stubs.h
index f2de6166d3aefb8aa47b768dde69e0df08442560..524db1093404e9307547c5f01b5878287d03d57e 100644
--- a/src/code-stubs.h
+++ b/src/code-stubs.h
@@ -283,6 +283,7 @@ struct CodeStubInterfaceDescriptor {
   ContinuationType continuation_type_;
   StubFunctionMode function_mode_;
   Register* register_params_;
+  Representation* param_representations_;
 
   Address deoptimization_handler_;
   HandlerArgumentsMode handler_arguments_mode_;
@@ -314,7 +315,11 @@ struct CodeStubInterfaceDescriptor {
     return has_miss_handler_;
   }
 
-  Register GetParameterRegister(int index) {
+  Representation GetParameterRepresentation(int index) const {
+    return param_representations_[index];
+  }
+
+  Register GetParameterRegister(int index) const {
     return register_params_[index];
   }
 
@@ -2351,6 +2356,12 @@ class ProfileEntryHookStub : public PlatformCodeStub {
   DISALLOW_COPY_AND_ASSIGN(ProfileEntryHookStub);
 };
 
+
+class CallDescriptors {
+ public:
+  static void InitializeForIsolate(Isolate* isolate);
+};
+
 } }  // namespace v8::internal
 
 #endif  // V8_CODE_STUBS_H_