[flang][cuda][openacc] Fix OpenACC use_device host association symbol copies (#194705) When a use_device object comes from host association, the OpenACC construct scope may already contain a HostAssocDetails symbol. Reusing that symbol prevents semantics from applying the CUDA DEVICE attribute, because the copied symbol is not an object entity. The fix materializes the expected host-associated symbol in the containing scope, then replaces the OpenACC-scope symbol with an ObjectEntityDetails copy that can carry the device attribute. This allows generic resolution and lowering to see the device version inside the host_data construct while preserving the host-associated binding needed by lowering.
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