Auto merge of #102536 - scottmcm:lookup_line-tweak, r=jackh726

Shorten the `lookup_line` code slightly

The `match` looks like it's exactly the same as `checked_sub(1)`, so we might as well see if perf says we can just do that to save a couple lines.
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bors 2022-10-24 07:24:45 +00:00
commit 7176b11147

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