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47025af639
This patch adds `host_assoc` attribute for operations that implement FortranVariableInterface (e.g. `hlfir.declare`). The attribute is used by the alias analysis to make better conclusions about memory overlap. For example, a dummy argument of an inner subroutine and a host's variable used inside the inner subroutine cannot refer to the same object (if the dummy argument does not satisify exceptions in F2018 15.5.2.13). This closes a performance gap between HLFIR optimization pipeline and FIR ArrayValueCopy for Polyhedron/nf.