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8509e7111d
* AstGen: always use `typeof` and never `typeof_elem` on the
`switch_cond`/`switch_cond_ref` instruction because both variants
return a value and not a pointer.
- Delete the `typeof_elem` ZIR instruction since it is no longer
needed.
* Sema: validateUnionInit now recognizes a comptime mutable value and
no longer emits a compile error saying "cannot evaluate constant
expression"
- Still to-do is detecting comptime union values in a function that
is not being executed at compile-time.
- This is still to-do for structs too.
* Sema: when emitting a call AIR instruction, call resolveTypeLayout on
all the parameter types as well as the return type.
* `Type.structFieldOffset` now works for unions in addition to structs.