Rollup merge of #142158 - xizheyin:141617, r=jdonszelmann

Tracking the old name of renamed unstable library features

This PR resolves the first problem of rust-lang/rust#141617 : tracking renamed unstable features. The first commit is to add a ui test, and the second one tracks the changes. I will comment on the code for clarification.

r? `@jdonszelmann`
There have been a lot of PR's reviewed by you lately, thanks for your time!

cc `@jyn514`

Author: matthiaskrgr