Auto merge of #105262 - eduardosm:more-inline-always, r=thomcc

Make some trivial functions `#[inline(always)]`

This is some kind of follow-up of PRs like https://github.com/rust-lang/rust/pull/85218, https://github.com/rust-lang/rust/pull/84061, https://github.com/rust-lang/rust/pull/87150. Functions that do very basic operations are made `#[inline(always)]` to avoid pessimizing them in debug builds when compared to using built-in operations directly.

diff --cc library/core/src/ptr/mod.rs
Simple merge

diff --cc library/core/src/slice/mod.rs
Simple merge