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float tests: deduplicate min, max, and rounding tests Part of https://github.com/rust-lang/rust/issues/141726 Best reviewed commit-by-commit. - Use `assert_biteq!` in the `mod.rs` tests. This requires some trickery to make shadowing macros with imports work. - The min, max, minimum, maximum tests in `tests/floats/f*.rs` are entirely subsumed by what we already have in `tests/float/mod.rs`, so I just removed them. - The rounding tests (floor etc) in `f*.rs` had more test points, so I copied them over. They didn't have `0.5` and `-0.5` though which seem like interesting points in particular regarding the sign of the resulting zero if that's what it sounds to, and they didn't max min/max/inf/nan tests, so this was really a merger of both tests. r? ``@tgross35``