Fix `explicit_counter_loop` FN when loop counter starts at non-zero (r…

…ust-lang#16620)

Closes rust-lang#16612

Previous implementation hardcoded `0` as loop counter start, this PR
lifts that restriction.

changelog: [`explicit_counter_loop`] fix FN when loop counter starts at
non-zero

Fix `unnecessary_to_owned` wrongly unmangled macros (rust-lang#16354)

Closes rust-lang#16351

changelog: [`unnecessary_to_owned`] fix wrongly unmangled macros

Rustup (rust-lang#16153)

r? @ghost

changelog: none

Rustup (rust-lang#15892)

r? @ghost

changelog: none

Rustup (rust-lang#15616)

r? @ghost

changelog: integer-to-pointer-transmutes are now handled by the upstream
`integer_to_ptr_transmutes` Rust lint and no longer by the
[`useless_transmute`] Clippy lint

Rustup (rust-lang#15341)

r? @ghost

changelog: none

Rustup (rust-lang#15044)

r? @ghost

changelog: none

Rustup (rust-lang#14721)

r? @ghost

changelog: none

fix: `missing_const_for_fn` FP on unstable const traits (rust-lang#14294

)

Closes rust-lang#14020
Closes rust-lang#14290
Closes rust-lang#14091

Add checks for unstable const traits.

changelog: [`missing_const_for_fn`] fix FP on unstable const traits

Rustup (rust-lang#14163)

r? @ghost

changelog: none