Remove FLAG_opt_safe_uint32_operations.

test/mjsunit/compiler/shift-shr.js

 // Copyright 2014 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 --noopt-safe-uint32-operations
+// Flags: --allow-natives-syntax
 
 // Check the results of `left >>> right`. The result is always unsigned (and
 // therefore positive).
 function test_shr(left) {
   var errors = 0;
 
   for (var i = 1; i < 1024; i++) {
     var temp = left >>> i;
     if (temp < 0) {
       errors++;
     }
   }
 
   return errors;
 }
 
 assertEquals(0, test_shr(1));
 %OptimizeFunctionOnNextCall(test_shr);
 for (var i = 5; i >= -5; i--) {
   assertEquals(0, test_shr(i));
 }