VM: New calling convention for generated code.

runtime/vm/dart_entry.cc

Index: runtime/vm/dart_entry.cc
diff --git a/runtime/vm/dart_entry.cc b/runtime/vm/dart_entry.cc
index 10c194bf8b265bdd7da6b422a6f62df679255c43..226dbe806fb98eb6238ab9e4ef638a90c971c235 100644
--- a/runtime/vm/dart_entry.cc
+++ b/runtime/vm/dart_entry.cc
@@ -90,8 +90,11 @@ RawObject* DartEntry::InvokeFunction(const Function& function,
     }
   }
   // Now Call the invoke stub which will invoke the dart function.
+  const Code& invoke_stub = Code::CheckedHandle(
+      isolate->stub_code()->InvokeDartCodeCode());
+
   invokestub entrypoint = reinterpret_cast<invokestub>(
-      isolate->stub_code()->InvokeDartCodeEntryPoint());
+      invoke_stub.EntryPoint());
   const Code& code = Code::Handle(zone, function.CurrentCode());
   ASSERT(!code.IsNull());
   ASSERT(Isolate::Current()->no_callback_scope_depth() == 0);
@@ -114,6 +117,12 @@ RawObject* DartEntry::InvokeFunction(const Function& function,
         reinterpret_cast<int32_t>(&arguments),
         reinterpret_cast<int32_t>(thread)));
 #endif
+#elif defined(TARGET_ARCH_X64)
+    return entrypoint(invoke_stub,
+                      code,
+                      arguments_descriptor,
+                      arguments,
+                      thread);
 #else
     return entrypoint(code.EntryPoint(),
                       arguments_descriptor,