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80cd53d3bb
My main gripes with this design were that it was incorrectly namespaced, the naming was inconsistent and a bit wrong (`fooAlign` vs `fooAlignment`). This commit moves all the logic from `PerThread.zig` to use the zcu + tid system that the previous couple commits introduce. I've organized and merged the functions to be a bit more specific to their own purpose. - `fieldAlignment` takes a struct or union type, an index, and a Zcu (or the Sema version which takes a Pt), and gives you the alignment of the field at the index. - `structFieldAlignment` takes the field type itself, and provides the logic to handle special cases, such as externs. A design goal I had in mind was to avoid using the word 'struct' in the function name, when it worked for things that aren't structs, such as unions.