re PR c++/11971 (ICE in cp_expr_size with variadic function call)

re PR c++/11971 (ICE in cp_expr_size with variadic function call)

        PR c++/11971
        * tree.c (build_local_temp): Split out from build_cplus_new.
        (force_target_expr): New fn.
        * call.c (call_builtin_trap): Call it.  Take a type parm.
        (convert_arg_to_ellipsis): Pass it.
        (build_x_va_arg): Use call_builtin_trap.

        PR c++/11929
        * call.c (magic_varargs_p): New fn.
        (build_over_call): Do no ellipsis conversions for arguments to
        functions with magic varargs.

From-SVN: r74462