Revert of [crankshaft] Fix IsClassOfTest helper method

test/mjsunit/regress/regress-5749.js

Index: test/mjsunit/regress/regress-5749.js
diff --git a/test/mjsunit/regress/regress-5749.js b/test/mjsunit/regress/regress-5749.js
deleted file mode 100644
index 42e88321efb0130543638fa682bb11250a04f272..0000000000000000000000000000000000000000
--- a/test/mjsunit/regress/regress-5749.js
+++ /dev/null
@@ -1,23 +0,0 @@
-// 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.
-
-// Flags: --allow-natives-syntax
-
-function f(x) {
-    (x ** 1) === '';
-}
-f();
-f();
-f();
-%OptimizeFunctionOnNextCall(f);
-f();
-
-function g(x) {
-    '' === (x ** 1);
-}
-g();
-g();
-g();
-%OptimizeFunctionOnNextCall(g);
-g();