Make missing_const_for_fn operate on non-optimized MIR

This has two reasons: First of all we don't need the optimized MIR for
evaluating the checks of this lint, as const-eval anyways operates on
`mir_for_ctf` which is derived from `mir_drops_elaborated_and_const_checked`.
Second of all we might transform MIR in the optimization passes in a way
that doesn't work with const-eval, but it is irrelevant since const-eval
uses another MIR.

Specifically this came up when adding a new check in debug builds
(https://github.com/rust-lang/rust/pull/134424), which is added as part
of an optimization pass.

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