[turbofan] Simply context specialization and fix for OSR.

test/mjsunit/compiler/osr-maze1.js

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Flags: --allow-natives-syntax --use-osr --turbo-deoptimization
 
 function bar(goal) {
   var count = 0;
   var sum = 11;
   var i = 35;
@@ skipping 24 matching lines @@
       }
     }
     while (j-- > 1) {
       if (count++ == goal) %OptimizeOsr();
       while (k-- > 6) {
         if (count++ == goal) %OptimizeOsr();
         sum = sum + j * 13;
       }
     }
   }
-  print(count);
   return sum;
 }
 
 for (var i = 0; i < 13; i++) {
   %DeoptimizeFunction(bar);
   assertEquals(348, bar(i));
 }