[AsmParser] Implicitly declare intrinsics (#78251) We currently require that all referenced globals have an explicit declaration or definition in the IR. For intrinsics, this requirement is redundant, because they cannot be called indirectly (including "direct" calls with mismatched function type). The function type used in the call directly determines the function type of the intrinsic declaration. Relax this requirement, and implicitly declare any intrinsics that do not have an explicit declaration. This will remove a common annoyance when writing tests and alive2 proofs. (I also plan to introduce a mode where declarations for all missing symbols will be automatically added, to make working with incomplete IR easier -- but that will be behind a default-disabled flag.)
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