[SAB] Fix crash in Atomics.wake w/ infinite count.

test/mjsunit/harmony/futex.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 --harmony-sharedarraybuffer
 
 (function TestFailsWithNonSharedArray() {
   var ab = new ArrayBuffer(16);
 
   var i8a = new Int8Array(ab);
@@ skipping 86 matching lines @@
 
 (function TestWaitNotAllowed() {
   %SetAllowAtomicsWait(false);
   var i32a = new Int32Array(new SharedArrayBuffer(16));
   assertThrows(function() {
     Atomics.wait(i32a, 0, 0, -1);
   });
   %SetAllowAtomicsWait(true);
 })();
 
+(function TestWakePositiveInfinity() {
+  var i32a = new Int32Array(new SharedArrayBuffer(16));
+  Atomics.wake(i32a, 0, Number.POSITIVE_INFINITY);
+})();
+
 //// WORKER ONLY TESTS
 
 if (this.Worker) {
 
   var TestWaitWithTimeout = function(timeout) {
     var sab = new SharedArrayBuffer(16);
     var i32a = new Int32Array(sab);
 
     var workerScript =
       `onmessage = function(msg) {
@@ skipping 104 matching lines @@
     // Finally wake the last waiter.
     assertEquals(1, Atomics.wake(i32a, 4, 1));
     assertEquals("ok", workers[waitingId].getMessage());
     workers[waitingId].terminate();
 
     assertEquals(0, %AtomicsNumWaitersForTesting(i32a, 4));
 
   })();
 
 }