Auto merge of #5620 - kennytm:compile-progress, r=matklad
Displays a one line progress of what crates are currently built.
cc #2536, #3448.
The change is based on #3451, but uses the progress bar introduced in #4646 instead. The percentage is simply the number of crates processed รท total crates count, which is inaccurate but better than nothing.
Output looks like:
[](https://asciinema.org/a/YTiBAz4K4vfidNTAnehtyH46l)