While you're here, I should say: first, thanks for your work, and second, it would be nice if the compiler could log the timing data in a consolidated form so my script wouldn't be necessary. :-) Regex-parsing and aggregating a bunch of log lines seems dicey.
Unfortunately, debug-time-function-bodies isn't an "officially" supported flag, so improving it isn't a high priority right now.
...That said, we'd be more than happy to take improvement PRs in this area, if you're feeling up for it!