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

src/js/harmony-atomics.js

Index: src/js/harmony-atomics.js
diff --git a/src/js/harmony-atomics.js b/src/js/harmony-atomics.js
index bfbf0c505e54bab3ff298f370de8d54c903114af..4f9d6218ff13b7f3eeb25120f1ef663169cae146 100644
--- a/src/js/harmony-atomics.js
+++ b/src/js/harmony-atomics.js
@@ -123,7 +123,11 @@ function AtomicsWaitJS(ia, index, value, timeout) {
 function AtomicsWakeJS(ia, index, count) {
   CheckSharedInteger32TypedArray(ia);
   index = ValidateIndex(index, %_TypedArrayGetLength(ia));
-  count = MaxSimple(0, TO_INTEGER(count));
+  if (IS_UNDEFINED(count)) {
+    count = INFINITY;
+  } else {
+    count = MaxSimple(0, TO_INTEGER(count));
+  }
   return %AtomicsWake(ia, index, count);
 }