Ensure large Smi-only arrays don't transition to FAST_DOUBLE_ARRAY

test/mjsunit/regress/regress-95113.js

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 // modification, are permitted provided that the following conditions are
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 //
 //     * Redistributions of source code must retain the above copyright
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@@ skipping 14 matching lines @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // Flags: --allow-natives-syntax
 
 function get_double_array() {
   var a = new Array(100000);
   var i = 0;
   while (!%HasFastDoubleElements(a)) {
     a[i] = i;
-    i++;
+    i += 0.5;
   }
   assertTrue(%HasFastDoubleElements(a));
   a.length = 1;
   a[0] = 1.5;
   a.length = 2;
   a[1] = 2.5;
   assertEquals(a[0], 1.5);
   assertEquals(a[1], 2.5);
   assertTrue(%HasFastDoubleElements(a));
   return a;
 }
 
 var a = get_double_array();