Fix IC cache confusion on String.prototype.length

test/mjsunit/regress/regress-416416.js

Index: test/mjsunit/regress/regress-416416.js
diff --git a/test/mjsunit/regress/regress-347906.js b/test/mjsunit/regress/regress-416416.js
similarity index 66%
copy from test/mjsunit/regress/regress-347906.js
copy to test/mjsunit/regress/regress-416416.js
index c751618928c93015679087ee1b500637657aa341..66e882e0fc348da422406c5ecf35ef454428455a 100644
--- a/test/mjsunit/regress/regress-347906.js
+++ b/test/mjsunit/regress/regress-416416.js
@@ -2,13 +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 --harmony
-
 function foo() {
-  return Math.clz32(12.34);
+  try {
+    String.prototype.length.x();
+  } catch (e) {
+  }
 }
 
 foo();
 foo();
-%OptimizeFunctionOnNextCall(foo);
 foo();