c++: refactor a few class.c fns

[Nathan Sidwell]

Storing CLASSTYPE_AS_BASE in a local variable makes some code clearer 
(and textually no longer).  For some reason we store a DECL in a 
variable called 'value', which is confusing.

             gcc/cp/
             * class.c (build_base_field_1): Cache CLASSTYPE_AS_BASE.
             (build_self_reference): Rename value -> decl.
             (dump_class_hierarchy_1): Cache CLASSTYPE_AS_BASE.

pushed
-- 
Nathan Sidwell
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