fold-const.c (fold): Avoid NOP_EXPRs better.

        * fold-const.c (fold) [COND_EXPR]: Avoid NOP_EXPRs better.

        * integrate.c (copy_decl_for_inlining): Don't clear the rtl for
        static/external decls.
cp/
        * call.c (build_conditional_expr): Stabilize lvalues properly.
        * cvt.c (ocp_convert): Don't build NOP_EXPRs of class type.
        * tree.c (lvalue_p_1): Don't allow sloppy NOP_EXPRs as lvalues.
        Don't allow CALL_EXPR or VA_ARG_EXPR, either.

        * call.c (convert_like_real): Call decl_constant_value for an
        IDENTITY_CONV even if there are no more conversions.

        * cvt.c (build_up_reference): Don't push unnamed temps.

        * decl2.c (do_namespace_alias): Namespace aliases are DECL_EXTERNAL.

        * dump.c (cp_dump_tree): Don't try to dump class-specific fields
        for a backend struct.

        * except.c (wrap_cleanups_r, build_throw): Make
        MUST_NOT_THROW_EXPRs void.
        * init.c (expand_default_init): Update to handle MUST_NOT_THROW_EXPR.

        * init.c (build_vec_delete_1): Pre-evaluate the base address.

        * init.c (get_temp_regvar): Simplify logic.

        * tree.c (cp_copy_res_decl_for_inlining): Only do debug tweaks if
        our replacement is a decl.

From-SVN: r60851