Preview of a first step towards unification of hydrogen calls

src/x64/code-stubs-x64.cc

Index: src/x64/code-stubs-x64.cc
diff --git a/src/x64/code-stubs-x64.cc b/src/x64/code-stubs-x64.cc
index 9ffb6720c38139291400650fb1919cf109146c0c..33774d35f5a9c9e1b1f54ba1cd7669e54c1e75ae 100644
--- a/src/x64/code-stubs-x64.cc
+++ b/src/x64/code-stubs-x64.cc
@@ -361,6 +361,56 @@ void NewStringAddStub::InitializeInterfaceDescriptor(
 }
 
 
+void CallDescriptors::InitializeForIsolate(Isolate* isolate) {
+  {
+    CallInterfaceDescriptor* descriptor =
+        isolate->call_descriptor(Isolate::ArgumentAdaptorCall);
+    static Register registers[] = { rdi,  // JSFunction
+                                    rsi,  // context
+                                    rax,  // actual number of arguments
+                                    rbx,  // expected number of arguments
+    };
+    static Representation representations[] = {
+        Representation::Tagged(),     // JSFunction
+        Representation::Tagged(),     // context
+        Representation::Integer32(),  // actual number of arguments
+        Representation::Integer32(),  // expected number of arguments
+    };
+    descriptor->register_param_count_ = 4;
+    descriptor->register_params_ = registers;
+    descriptor->param_representations_ = representations;
+  }
+  {
+    CallInterfaceDescriptor* descriptor =
+        isolate->call_descriptor(Isolate::KeyedCall);
+    static Register registers[] = { rsi,  // context
+                                    rcx,  // key
+    };
+    static Representation representations[] = {
+        Representation::Tagged(),     // context
+        Representation::Tagged(),     // key
+    };
+    descriptor->register_param_count_ = 2;
+    descriptor->register_params_ = registers;
+    descriptor->param_representations_ = representations;
+  }
+  {
+    CallInterfaceDescriptor* descriptor =
+        isolate->call_descriptor(Isolate::NamedCall);
+    static Register registers[] = { rsi,  // context
+                                    rcx,  // name
+    };
+    static Representation representations[] = {
+        Representation::Tagged(),     // context
+        Representation::Tagged(),     // name
+    };
+    descriptor->register_param_count_ = 2;
+    descriptor->register_params_ = registers;
+    descriptor->param_representations_ = representations;
+  }
+}
+
+
 #define __ ACCESS_MASM(masm)