Auto merge of #118966 - matthiaskrgr:rollup-sdvjwy6, r=matthiaskrgr

Rollup of 3 pull requests

Successful merges:

 - #116888 (Add discussion that concurrent access to the environment is unsafe)
 - #118888 (Uplift `TypeAndMut` and `ClosureKind` to `rustc_type_ir`)
 - #118929 (coverage: Tidy up early parts of the instrumentor pass)

r? `@ghost`
`@rustbot` modify labels: rollup