Bug 1480725 - mark tests as slow temporarily r=me CLOSED TREE

--HG--
extra : rebase_source : 541ad19ea373961258df7ffe29e675176e63958b

js/src/jit-test/tests/wasm/atomicity.js

@@ -1,3 +1,8 @@
+// |jit-test| slow;
+//
+// Temporarily marked as slow - they time out on the build systems even with
+// reduced iteration count.
+//
 // Test that wasm atomic operations implement correct mutual exclusion.
 //
 // We have several agents that attempt to hammer on a shared location with rmw