Fix left trimming check for large objects

test/mjsunit/regress/regress-358090.js

Index: test/mjsunit/regress/regress-358090.js
diff --git a/test/mjsunit/regress/regress-355485.js b/test/mjsunit/regress/regress-358090.js
similarity index 68%
copy from test/mjsunit/regress/regress-355485.js
copy to test/mjsunit/regress/regress-358090.js
index 3c66884c000dd5860b2bd9c82705f7a58afb28ae..d9c07e857dd531c5b32460ee71cdf2ec87da910c 100644
--- a/test/mjsunit/regress/regress-355485.js
+++ b/test/mjsunit/regress/regress-358090.js
@@ -2,4 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-assertEquals("\u039c", "\u00b5".toUpperCase());
+var x = Array(100000);
+y =  Array.apply(Array, x);
+y.unshift(4);
+y.shift();