[CIR][Dialect] Add verification of address space to get_global
#787
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This PR verifies
cir.get_global
has its result type correctly annotated with address space of the referenced symbol. The documentation is also updated to clarify this constraint.GlobalOp
is the main consideration. It's worth noting that if thecir.get_global
op references a function, we also (implicitly) checks that its result pointer type has no address space attribute.