Auto merge of #119396 - Nadrieril:intersection-tracking, r=WaffleLapkin

Exhaustiveness: track overlapping ranges precisely

The `overlapping_range_endpoints` lint has false positives, e.g. rust-lang/rust#117648. I expected that removing these false positives would have too much of a perf impact but never measured it. This PR is an experiment to see if the perf loss is manageable.

r? `@ghost`

Author: bors