c++: Post-pending redesign cleanup [PR 99170]

[Nathan Sidwell]

With pending entities reimplemented, the remaining use of uintset can 
just use a regular hash map -- I only used a uintset because it was 
there. So one adhoc hash-table/vector structure goes away.

         PR c++/99170
         gcc/cp/
         * module.cc (class uintset): Delete.
         (typedef attached_map_t): A hash map.
         (attached_table): Use attached_map_t.  Adjust uses ...
	(trees_out::decl_value, trees_in::decl_value): ... here	...
         (trees_out::key_mergeable): ...	here ...
         (trees_in::key_mergeable): ... here ...
         (maybe_attach_decl): ... here ...
         (direct_import): ... and here.

-- 
Nathan Sidwell
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