Auto merge of #5828 - kennytm:compile-progress-names, r=alexcrichton
Auto merge of #5828 - kennytm:compile-progress-names, r=alexcrichton

-Zcompile-progress: Use the target name in the progress bar when building a test/binary.

Thus fixes hilarious output like
https://twitter.com/ManishEarth/status/1015479576670027776.

New output: https://asciinema.org/a/F1rkCk0bTWKQMr1NEScia3IYx

nipunn1313/cargo,tsurai/cargo,rustyhorde/cargo,tshepang/cargo,rust-lang/cargo,tsurai/cargo,rust-lang/cargo,eminence/cargo,tsurai/cargo,rust-lang/cargo,vojtechkral/cargo,tsurai/cargo,eminence/cargo,eminence/cargo,rustyhorde/cargo,vojtechkral/cargo,eminence/cargo,tshepang/cargo,tshepang/cargo,tshepang/cargo,vojtechkral/cargo,rustyhorde/cargo,nipunn1313/cargo,tsurai/cargo,rustyhorde/cargo,vojtechkral/cargo,rust-lang/cargo,nipunn1313/cargo,nipunn1313/cargo