Remove harmony-atomics flag and collapse it into sharedarraybuffer flag

test/mjsunit/harmony/atomics.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: --harmony-atomics --harmony-sharedarraybuffer
+// Flags: --harmony-sharedarraybuffer
 //
 
 function toRangeWrapped(value) {
   var range = this.max - this.min + 1;
   while (value < this.min) {
     value += range;
   }
   while (value > this.max) {
     value -= range;
   }
@@ skipping 486 matching lines @@
       // Exchange
       sta[0] = val = 0x12;
       operand = 0x22 + offset;
       valWrapped = t.toRange(operand);
       assertEquals(val, Atomics.exchange(sta, 0, operand), name);
       assertEquals(valWrapped, sta[0], name);
     }
 
   });
 })();