VM [KERNEL] Use simpleInstanceOf in kernel.

runtime/vm/object.cc

Index: runtime/vm/object.cc
diff --git a/runtime/vm/object.cc b/runtime/vm/object.cc
index 2aed4a855b3641069f22fa154f14f837c41cefd3..12669a04e07475166a465d497b48aa05bea980a8 100644
--- a/runtime/vm/object.cc
+++ b/runtime/vm/object.cc
@@ -16678,6 +16678,23 @@ const char* AbstractType::ToCString() const {
 }
 
 
+bool simpleInstanceOfType(const AbstractType& type) {
+  // Bail if the type is still uninstantiated at compile time.
+  if (!type.IsInstantiated()) return false;
+
+  // Bail if the type is a function or a Dart Function type.
+  if (type.IsFunctionType() || type.IsDartFunctionType()) return false;
+
+  ASSERT(type.HasResolvedTypeClass());
+  const Class& type_class = Class::Handle(type.type_class());
+  // Bail if the type has any type parameters.
+  if (type_class.IsGeneric()) return false;
+
+  // Finally a simple class for instance of checking.
+  return true;
+}
+
+
 RawType* Type::NullType() {
   return Isolate::Current()->object_store()->null_type();
 }