[turbofan] Don't use the CompareIC in JSGenericLowering.

test/mjsunit/regress/regress-4788-1.js

Index: test/mjsunit/regress/regress-4788-1.js
diff --git a/test/mjsunit/regress/regress-4788-1.js b/test/mjsunit/regress/regress-4788-1.js
new file mode 100644
index 0000000000000000000000000000000000000000..347ab5e59299b320981287dab6a2b19f1f8c5a1c
--- /dev/null
+++ b/test/mjsunit/regress/regress-4788-1.js
@@ -0,0 +1,25 @@
+// 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
+
+var f = (function() {
+  "use asm";
+  function foo(x) {
+    return x == 0;
+  }
+  return foo;
+})();
+
+function deopt(f) {
+  return {
+    toString : function() {
+      %DeoptimizeFunction(f);
+      return "2";
+    }
+  };
+}
+
+%OptimizeFunctionOnNextCall(f);
+assertFalse(f(deopt(f)));