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b2deaf8027
* zir.Code: introduce a decls array. This is so that `decl_val` and `decl_ref` instructions can refer to a Decl with a u32 and therefore they can also store a source location. This is needed for proper compile error reporting. * astgen uses a hash map to avoid redundantly adding a Decl to the decls array. * fixed reporting "instruction illegal outside function body" instead of the desired message "unable to resolve comptime value". * astgen skips emitting dbg_stmt instructions in comptime scopes. * astgen has some logic to avoid adding unnecessary type coercion instructions for common values.