[Atomics] Make Atomics.store a builtin using TF

test/mjsunit/harmony/atomics.js

Index: test/mjsunit/harmony/atomics.js
diff --git a/test/mjsunit/harmony/atomics.js b/test/mjsunit/harmony/atomics.js
index 8973921ad57900f1b19dfaf973e28615080be8ed..e608df3342f2ea6a56428dc652a74e5615b83692 100644
--- a/test/mjsunit/harmony/atomics.js
+++ b/test/mjsunit/harmony/atomics.js
@@ -421,7 +421,7 @@ function clearArray(sab) {
       assertEquals(50, Atomics.compareExchange(sta, 0, v, v), name);
 
       // Store
-      assertEquals(+v, Atomics.store(sta, 0, v), name);
+      assertEquals(v|0, Atomics.store(sta, 0, v), name);
       assertEquals(v|0, sta[0], name);
 
       // Add