Fixed constant folding for Math.clz32.

test/mjsunit/regress/regress-347906.js

Index: test/mjsunit/regress/regress-347906.js
diff --git a/test/mjsunit/regress/regress-347542.js b/test/mjsunit/regress/regress-347906.js
similarity index 68%
copy from test/mjsunit/regress/regress-347542.js
copy to test/mjsunit/regress/regress-347906.js
index 901d798fb7fbea45f0d9f3d8ba6c7a9846bf6dd6..c751618928c93015679087ee1b500637657aa341 100644
--- a/test/mjsunit/regress/regress-347542.js
+++ b/test/mjsunit/regress/regress-347906.js
@@ -2,10 +2,13 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax
+// Flags: --allow-natives-syntax --harmony
 
-function foo() {}
+function foo() {
+  return Math.clz32(12.34);
+}
+
+foo();
 foo();
 %OptimizeFunctionOnNextCall(foo);
 foo();
-%NeverOptimizeFunction(foo);