[builtins] Move builtins into own files

src/builtins/builtins-internal.cc

+// Copyright 2016 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "src/builtins/builtins.h"
+#include "src/builtins/builtins-utils.h"
+
+namespace v8 {
+namespace internal {
+
+BUILTIN(Illegal) {
+  UNREACHABLE();
+  return isolate->heap()->undefined_value();  // Make compiler happy.
+}
+
+BUILTIN(EmptyFunction) { return isolate->heap()->undefined_value(); }
+
+// -----------------------------------------------------------------------------
+// Throwers for restricted function properties and strict arguments object
+// properties
+
+BUILTIN(RestrictedFunctionPropertiesThrower) {
+  HandleScope scope(isolate);
+  THROW_NEW_ERROR_RETURN_FAILURE(
+      isolate, NewTypeError(MessageTemplate::kRestrictedFunctionProperties));
+}
+
+BUILTIN(RestrictedStrictArgumentsPropertiesThrower) {
+  HandleScope scope(isolate);
+  THROW_NEW_ERROR_RETURN_FAILURE(
+      isolate, NewTypeError(MessageTemplate::kStrictPoisonPill));
+}
+
+}  // namespace internal
+}  // namespace v8