Revert "async_hooks: only set up hooks if used"

This reverts commit 410b141.

PR-URL: #13509
Reviewed-By: Andreas Madsen <amwebdk@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>

Author: trevnorris

lib/async_hooks.js

@@ -49,7 +49,12 @@ const before_symbol = Symbol('before');
 const after_symbol = Symbol('after');
 const destroy_symbol = Symbol('destroy');
 
-let setupHooksCalled = false;
+// Setup the callbacks that node::AsyncWrap will call when there are hooks to
+// process. They use the same functions as the JS embedder API.
+async_wrap.setupHooks({ init,
+                        before: emitBeforeN,
+                        after: emitAfterN,
+                        destroy: emitDestroyN });
 
 // Used to fatally abort the process if a callback throws.
 function fatalError(e) {
@@ -98,16 +103,6 @@ class AsyncHook {
     if (hooks_array.includes(this))
       return this;
 
-    if (!setupHooksCalled) {
-      setupHooksCalled = true;
-      // Setup the callbacks that node::AsyncWrap will call when there are
-      // hooks to process. They use the same functions as the JS embedder API.
-      async_wrap.setupHooks({ init,
-                              before: emitBeforeN,
-                              after: emitAfterN,
-                              destroy: emitDestroyN });
-    }
-
     // createHook() has already enforced that the callbacks are all functions,
     // so here simply increment the count of whether each callbacks exists or
     // not.