Bug 1431353 - Remove limit on number of threads used for off-thread parsing r=luke

js/src/vm/HelperThreads.cpp

@@ -1192,12 +1192,7 @@ GlobalHelperThreadState::maxParseThreads() const
 {
     if (IsHelperThreadSimulatingOOM(js::THREAD_TYPE_PARSE))
         return 1;
-
-    // Don't allow simultaneous off thread parses, to reduce contention on the
-    // atoms table. Note that wasm compilation depends on this to avoid
-    // stalling the helper thread, as off thread parse tasks can trigger and
-    // block on other off thread wasm compilation tasks.
-    return 1;
+    return cpuCount;
 }
 
 size_t