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Run most `core::num` tests in const context too This adds some infrastructure for something I was going to use in #131566, but it felt worthwhile enough on its own to merge/discuss separately. Essentially, right now we tend to rely on UI tests to ensure that things work in const context, rather than just using library tests. This uses a few simple macro tricks to make it *relatively* painless to execute tests in both runtime and compile-time context. And this only applies to the numeric tests, and not anything else. Recommended to review without whitespace in the diff. cc `@RalfJung`