Move helper function for missing_const_for_fn
out of rustc to clippy
#77231
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cc @rust-lang/clippy @ecstatic-morse #76618
r? @Manishearth
I also removed all support for suggesting a function could be
const fn
when that would require feature gates to actually work.This means we'll now have to maintain this ourselves in clippy, but that's how most lints work anyway, so...