process: register the inspector async hooks in bootstrap/node.js

So it's easier to tell the side effects of this setup.
PR-URL: #25443
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

Author: joyeecheung

lib/internal/bootstrap/node.js

@@ -151,7 +151,11 @@ function startup() {
 }
 
 if(config.hasInspector){
-NativeModule.require('internal/inspector_async_hook').setup();
+const{
+ enable,
+ disable
+}=NativeModule.require('internal/inspector_async_hook');
+internalBinding('inspector').registerAsyncHook(enable,disable);
 }
 
 // If the process is spawned with env NODE_CHANNEL_FD, it's probably

lib/internal/inspector_async_hook.js

@@ -1,16 +1,10 @@
 'use strict';
 
-constinspector=internalBinding('inspector');
-
-if(!inspector||!inspector.asyncTaskScheduled){
-exports.setup=function(){};
-return;
-}
-
 lethook;
 letconfig;
 
 functionlazyHookCreation(){
+constinspector=internalBinding('inspector');
 const{ createHook }=require('async_hooks');
 config=internalBinding('config');
 
@@ -72,6 +66,7 @@ function disable() {
 hook.disable();
 }
 
-exports.setup=function(){
-inspector.registerAsyncHook(enable,disable);
+module.exports={
+ enable,
+ disable
 };