c++: Name as_base type

[Nathan Sidwell]

The as-base type never got a name.  For modules I needed to give it a 
name to serialize properly, and it's useful when debugging the compiler, 
so we may as well have it on trunk.  There's also a bug where its fields 
can have NSDMIs from the main class.  This happens to be silent on 
trunk, but can be a GC leak where we retain a deferred parse node there. 
(On modules it blows up, because we're not prepared to serialize 
deferred parse nodes, as they should never survive parsing.

             gcc/cp/
             * cp-tree.h (enum cp_tree_index): Add CPTI_AS_BASE_IDENTIFIER.
             (as_base_identifier): Define.
             * decl.c (initialize_predifined_identifiers): Initialize 
as_base
             identifier.
             * class.c (layout_class_type): Name the as-base type.  Zap
             NSDMI its fields may have.

-- 
Nathan Sidwell
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