* tree.h (STRIP_NOPS): Check for error_mark_node.
        (STRIP_SIGN_NOPS, STRIP_TYPE_NOPS): Likewise.
        (dwarf2out_*): Remove duplicate declarations.

        * c-decl.c (duplicate_decls): Copy DECL_ABSTRACT_ORIGIN from
        DECL_ABSTRACT_ORIGIN, not DECL_ORIGIN.

From-SVN: r34939