Remove harmony-atomics flag and collapse it into sharedarraybuffer flag

test/mjsunit/d8-worker-sharedarraybuffer.js

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-// Flags: --harmony-sharedarraybuffer --harmony-atomics
+// Flags: --harmony-sharedarraybuffer
 
 if (this.Worker) {
 
   (function TestTransfer() {
     var workerScript =
       `onmessage = function(m) {
        var sab = m;
        var ta = new Uint32Array(sab);
        if (sab.byteLength !== 16) {
          throw new Error('SharedArrayBuffer transfer byteLength');
@@ skipping 58 matching lines @@
           // Worker is finished.
           assertEquals(id, workers[id].getMessage());
           workers[id].terminate();
           count++;
         }
       }
     }
   })();
 
 }