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Some asm! diagnostic adjustments and a papercut fix Best reviewed commit by commit. We forgot a `normalize` call in intrinsic checking, causing us to allow literal integers, but not named constants containing that literal. This can in theory affect stable code, but only if libstd contains a stable SIMD type that has an array length that is a named constant. I'd assume we'd have noticed by now due to asm! rejecting those outright. The error message left me scratching my head for a bit, so I added some extra information to the diagnostic, too.
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.