Auto merge of #58784 - oli-obk:accidental_promotion, r=eddyb

Don't promote function calls to nonpromotable things

fixes https://github.com/rust-lang/rust/issues/58767 and fixes https://github.com/rust-lang/rust/issues/58634

r? @eddyb

should we additionally check the function call return type? It might be a promotable function (or any `const fn` inside a `const fn`), but its return type might contain interior mutability.

diff --cc src/librustc_mir/transform/qualify_consts.rs
Simple merge