[AsmParser] Add missing globals declarations in incomplete IR mode #79855
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If `-allow-incomplete-ir` is enabled, automatically insert declarations for missing globals. If a global is only used in calls with the same function type, insert a function declaration with that type. Otherwise, insert a dummy i8 global. The fallback case could be extended with various heuristics (e.g. we could look at load/store types), but I've chosen to keep it simple for now, because I'm unsure to what degree this would really useful without more experience (I expect that in most cases the declaration type doesn't really matter).
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If
-allow-incomplete-iris enabled, automatically insert declarations for missing globals.If a global is only used in calls with the same function type, insert a function declaration with that type.
Otherwise, insert a dummy i8 global. The fallback case could be extended with various heuristics (e.g. we could look at load/store types), but I've chosen to keep it simple for now, because I'm unsure to what degree this would really useful without more experience. I expect that in most cases the declaration type doesn't really matter (note that the type of an external global specifies a minimum size only, not a precise size).
This is a followup to #78421.