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1b672e41c5
This changeset fixes the handling of alignment in several places. The new rules are: * `@alignOf(T)` where `T` is a runtime zero-bit type is at least 1, maybe greater. * Zero-bit fields in `extern` structs *do* force alignment, potentially offsetting following fields. * Zero-bit fields *do* have addresses within structs which can be observed and are consistent with `@offsetOf`. These are not necessarily all implemented correctly yet (see disabled test), but this commit fixes all regressions compared to master, and makes one new test pass.