Use standard attribute logic for allocator shim

Use llfn_attrs_from_instance() to generate the attributes for the
allocator shim. This ensures that we generate all the usual
attributes (and don't get to find out one-by-one that a certain
attribute is important for a certain target). Additionally this
will enable emitting the allocator-specific attributes (not
included here).

This change is quite awkward because the allocator shim uses
SimpleCx, while llfn_attrs_from_instance uses CodegenCx. I've
switched it to use SimpleCx plus tcx/sess arguments where necessary.
If there's a simpler way to do this, I'd love to know about it...

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