Teach CIR pointers about address space

[bcardosolopes]

We don't support that yet. A good place to start is to change addressSpace() and addressSpaceInGlobalVar() functions to return true in clang/lib/CIR/CodeGen/UnimplementedFeatureGuarding.h, run ninja check-clang-cir and start working over the found crashes.

(cc: @sommerlukas @sitio-couto)

[seven-mile]

Maybe it's OK to assign this to me? It's a general issue though.

[bcardosolopes]

Sure!

[bcardosolopes]

@seven-mile let me know once we can close this.

[seven-mile]

Solved in #724.