Rollup merge of #46762 - est31:master, r=alexcrichton
Rollup merge of #46762 - est31:master, r=alexcrichton

Stabilize the panic_col feature

I've added the panic_col feature in PR #42938.
Now it's time to stabilize it!
Closes #42939.

GBGamer/rust,graydon/rust,graydon/rust,aidancully/rust,GBGamer/rust,GBGamer/rust,GBGamer/rust,GBGamer/rust,graydon/rust,GBGamer/rust,aidancully/rust,graydon/rust,GBGamer/rust,aidancully/rust,GBGamer/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,aidancully/rust