Add support for discarding unused virtual functions.
* search.c (dfs_search, binfo_for_vtable, dfs_bfv_helper): New fns. * decl2.c (output_vtable_inherit): Call binfo_for_vtable. * lang-options.h: Add -fvtable-gc. * cp-tree.h: Add flag_vtable_gc. * decl2.c (output_vtable_inherit): New fn. (finish_vtable_vardecl): Call it. * class.c (build_vtable_entry_ref): New fn. (build_vtbl_ref): Call it. From-SVN: r22061
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