async_hooks: require parameter in emitBefore

Using asyncId as the default triggerAsyncId is wrong. The triggerAsyncId
can actually never be the asyncId.

PR-URL: https://github.com/nodejs/node/pull/14050
Reviewed-By: Trevor Norris <trev.norris@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>

lib/async_hooks.js

@@ -377,7 +377,7 @@ function emitHookFactory(symbol, name) {
 
 // Usage: emitBeforeS(asyncId[, triggerAsyncId]). If triggerAsyncId is omitted
 // then asyncId will be used instead.
-function emitBeforeS(asyncId, triggerAsyncId = asyncId) {
+function emitBeforeS(asyncId, triggerAsyncId) {
   // CHECK(Number.isSafeInteger(asyncId) && asyncId > 0)
   // CHECK(Number.isSafeInteger(triggerAsyncId) && triggerAsyncId > 0)