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083ee8e0e2
Some builtin types have a special InternPool index (e.g. `.type_info_type`) so that AstGen can refer to them before semantic analysis. Unfortunately, this previously led to a second index existing to refer to the type once it was resolved, complicating Sema by having the concept of an "unresolved" type index. This change makes Sema modify these InternPool indices in-place to contain the expanded representation when resolved. The analysis of the corresponding decls is caught in `Module.semaDecl`, and a field is set on Sema telling it which index to place struct/union/enum types at. This system could break if `std.builtin` contained complex decls which evaluate multiple struct types, but this will be caught by the assertions in `InternPool.resolveBuiltinType`. The AstGen result types which were disabled in 6917a8c have been re-enabled. Resolves: #16603