c++: Rename DECL_BUILTIN_P to DECL_UNDECLARED_BUILTIN_P

[Nathan Sidwell]

I realized I'd misnamed	DECL_BUILTIN_P,	it's only true of compiler
builtins unless and until the user declares them -- at that point
they're real decls, and	will have a location in	the user's source.
(BUILT_IN_FN and friends still work though).  This renames them	so
future-me is not confused as to why the predicate becomes false.


	gcc/cp/
         * cp-tree.h (DECL_BUILTIN_P): Rename to	...
         (DECL_UNDECLARED_BUILTIN_P): ... here.
         * decl.c (duplicate_decls): Adjust.
         * name-lookup.c	(anticipated_builtin_p): Adjust.
         (do_nonmember_using_decl): Likewise.
         libcc1/
         * libcp1plugin.cc (supplement_binding):	Rename
	DECL_BUILTIN_P.


pushing to trunk

nathan
-- 
Nathan Sidwell
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