cf4aad4858
Sema avoids adding map entries for certain instructions such as `set_eval_branch_quota` and `atomic_store`. This means that result location semantics in AstGen must not emit any instructions that attempt to use the result of any of these instructions. This commit makes AstGen replace such instructions with `Zir.Inst.Ref.void_value` if their result value ends up being referenced. This fixes a compiler crash when running std lib atomic tests.
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