ccall: handle Union appearing as a field-type without crashing #46787
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We disallow union as the direct type, so perhaps we should disallow it as a field-type also, but since we do allow references in those cases typically, we will allow this also.
Also DRY the emit_global code, since it had bit-rotted relative to the usual code path through emit_globalref (and apparently could still be run though for handling the first argument to cfunction).
Fix #46786