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Instead allow the const to be converted and each time it is const evaluated as part of another expression. This allows an abstract const to be used as a different type depending on the context. A consequence of this is that abstract types may now find their way to the validation stage, which we don't want. We therefore additionally now ensure that the compact pass removes global constants of abstract types. This will have no *functional* effect on shaders generated by the backends, as the expressions belonging to the abstract consts in the IR will not actually be used, as any usage in the input shader will have been const-evaluated away. Certain unused const declarations will now be removed, however, as can be seen by the effect on the snapshot outputs.