tls: improve debugging assertion

Refs: https://github.com/nodejs/node/issues/22618

PR-URL: https://github.com/nodejs/node/pull/22625
Reviewed-By: Anatoli Papirovski <apapirovski@mac.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>

lib/_tls_wrap.js

@@ -64,7 +64,8 @@ function onhandshakestart(now) {
   debug('onhandshakestart');
 
   const { lastHandshakeTime } = this;
-  assert(now >= lastHandshakeTime);
+  assert(now >= lastHandshakeTime,
+         `now (${now}) < lastHandshakeTime (${lastHandshakeTime})`);
 
   this.lastHandshakeTime = now;