Rollup merge of #124508 - Zalathar:op, r=jieyouxu

coverage: Avoid hard-coded values when visiting logical ops

This is a tiny little thing that I noticed during the final review of #123409, and I didn't want to hold up the whole PR just for this.

Instead of separately hard-coding the operation being visited, we can get it from the match arm pattern by using an as-pattern.

`@rustbot` label +A-code-coverage

Author: jieyouxu