[stubs] An easier way of defining a stub call interface descriptor.

src/x64/interface-descriptors-x64.cc

Index: src/x64/interface-descriptors-x64.cc
diff --git a/src/x64/interface-descriptors-x64.cc b/src/x64/interface-descriptors-x64.cc
index 0ce65223f2b5ece6c819e4ff7748471698dba55b..1b78b221f17bcc13d1c39db32c40230e5fa4808c 100644
--- a/src/x64/interface-descriptors-x64.cc
+++ b/src/x64/interface-descriptors-x64.cc
@@ -11,6 +11,14 @@ namespace internal {
 
 const Register CallInterfaceDescriptor::ContextRegister() { return rsi; }
 
+void CallInterfaceDescriptor::DefaultInitializePlatformSpecific(
+    CallInterfaceDescriptorData* data, int register_parameter_count) {
+  const Register default_stub_registers[] = {rax, rbx, rcx, rdx, rdi};
+  CHECK_LE(static_cast<size_t>(register_parameter_count),
+           arraysize(default_stub_registers));
+  data->InitializePlatformSpecific(register_parameter_count,
+                                   default_stub_registers);
+}
 
 const Register LoadDescriptor::ReceiverRegister() { return rdx; }
 const Register LoadDescriptor::NameRegister() { return rcx; }
@@ -63,8 +71,6 @@ const Register MathPowIntegerDescriptor::exponent() {
 const Register GrowArrayElementsDescriptor::ObjectRegister() { return rax; }
 const Register GrowArrayElementsDescriptor::KeyRegister() { return rbx; }
 
-const Register HasPropertyDescriptor::ObjectRegister() { return rax; }
-const Register HasPropertyDescriptor::KeyRegister() { return rbx; }
 
 void FastNewClosureDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {