src: list used functions on headers

PR-URL: #30827
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>
Reviewed-By: Minwoo Jung <nodecorelab@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: David Carlier <devnexen@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Anto Aravinth <anto.aravinth.cse@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>

src/node_platform.cc

@@ -3,9 +3,9 @@
 
 #include "env-inl.h"
 #include "debug_utils.h"
-#include <algorithm>
-#include <cmath>
-#include <memory>
+#include <algorithm>  // find_if(), find(), move()
+#include <cmath>  // llround()
+#include <memory>  // unique_ptr(), shared_ptr(), make_shared()
 
 namespace node {