Adding eventlog trace functions for profiling.

[rohit507]

First, thanks for writing this, it's quickly become my favorite custom Prelude.

I was wondering if you could add traceEvent, traceEventIO, traceMarker, and traceMarkerIO from Debug.Trace to Intro. You're already exporting a number of other functions from that module, and heap profiling seems like a natural extension.

Possibly with links to https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/profiling.html and/or https://mpickering.github.io/eventlog2html/ in the haddocks so people can see how to use them.

[minad]

Yes, They could be added. PR welcome - otherwise I can add them when I prepare the next release.

The question is only how often these functions are used. I am using traceShow and friends very often during some quick debugging a, but only rarely I look at the event log.