So I have to ask WHY this information was not in the changelog of the patch
in question:
1) How it works
2) Why comments have been chosen over macros
In preparation to enabling -Wimplicit-fallthrough, mark switch cases
where we are expecting to fall through.
It's not a reviewers job to chase that information down.
While I can understand that the comments are intentional due to existing
tools, I still prefer the macro/annotation. But I'm not religious about it
when there is common consensus. :)