Rollup merge of #155147 - sorairolake:stabilize-int-lowest-highest-one, r=jhpratt

Stabilize feature `int_lowest_highest_one`

Tracking issue: rust-lang/rust#145203
FCP is finished in rust-lang/rust#145203 (comment)

Closes rust-lang/rust#145203

@rustbot modify labels: +T-libs-api

Author: JonathanBrouwer