Rollup merge of #69850 - RalfJung:panic-bounds-check, r=eddyb

Rollup merge of #69850 - RalfJung:panic-bounds-check, r=eddyb

panic_bounds_check: use caller_location, like PanicFnLangItem

The `PanicFnLangItem` got switched to using `#[caller_location]` at some point, but `PanicBoundsCheckFnLangItem` was kept in the old style. For consistency, switch that one over to use `#[caller_location]` as well.

This is also helpful for Miri as it means the `assert_panic` machine hook never needs to know the current `Span`.