Remove some busy-OSR loops from tests using %OptimizeOsr().

test/mjsunit/regress/string-set-char-deopt.js

 // Copyright 2014 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
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@@ skipping 18 matching lines @@
 
 (function OneByteSeqStringSetCharDeoptOsr() {
   function deopt() {
     %DeoptimizeFunction(f);
   }
 
   function f(string, osr) {
     var world = " world";
     %_OneByteSeqStringSetChar(0, (deopt(), 0x48), string);
 
-    if (osr) while (%GetOptimizationStatus(f) == 2) {}
+    for (var i = 0; osr && i < 2; i++) %OptimizeOsr();
 
     return string + world;
   }
 
   assertEquals("Hello " + "world", f("hello", false));
   %OptimizeFunctionOnNextCall(f);
   assertEquals("Hello " + "world", f("hello", true));
 })();
 
 
@@ skipping 26 matching lines @@
 
   function f(string) {
     g(%_TwoByteSeqStringSetChar(0, (deopt(), 0x48), string));
     return string;
   }
 
   assertEquals("Hell" + "o", f("\u20ACello"));
   %OptimizeFunctionOnNextCall(f);
   assertEquals("Hell" + "o", f("\u20ACello"));
 })();