Treat f16 and f128 as floats in constant evaluation

[samueltardieu]

Basis for enabling handling of f16 and f128 in other existing lints.

changelog: none

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[dswij]

@samueltardieu seems like some CI job failed

[samueltardieu]

@samueltardieu seems like some CI job failed

Yeah, it looks like MSVC doesn't support some things related to either f16 or f128, I'll investigate.

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[rustbot]

This PR was rebased onto a different master commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.