[test] Speed up some slow tests.

test/mjsunit/math-floor-part4.js

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 75 matching lines @@
   testFloor(0, 0);
   testFloor(0, zero());
   testFloor(-0, -0);
   testFloor(Infinity, Infinity);
   testFloor(-Infinity, -Infinity);
   testFloor(NaN, NaN);
 }
 
 
 // Test in a loop to cover the custom IC and GC-related issues.
-for (var i = 0; i < 100; i++) {
+for (var i = 0; i < 10; i++) {
   test();
+  new Array(i * 10000);
 }
 
-
 // Regression test for a bug where a negative zero coming from Math.floor
 // was not properly handled by other operations.
 function floorsum(i, n) {
   var ret = Math.floor(n);
   while (--i > 0) {
     ret += Math.floor(n);
   }
   return ret;
 }
 assertEquals(-0, floorsum(1, -0));
 %OptimizeFunctionOnNextCall(floorsum);
 // The optimized function will deopt.  Run it with enough iterations to try
 // to optimize via OSR (triggering the bug).
 assertEquals(-0, floorsum(100000, -0));