Draft: Dtrace on linux

This is a rebase of !5529 (closed).

The hadrian changes need careful review from someone more familiar.

Thre release notes likely need an edit.

I've added a test, which passes on my machine. However I've commented it out as it requires bpftrace and sudo. Let me know what I should do about it.

I've succeeded in seeing events in perf, it required adding stage1.rts.ghc.link.opts += -optl-Wl,--build-id to hadrian.settings.

cc @adamse