revert: re PR c++/71737 (ICE following 2x packexpansion... 2017-01-16 Paolo Carlini <paolo.carlini@oracle.com> 2017-01-16 Paolo Carlini <paolo.carlini@oracle.com> 2017-01-16 Paolo Carlini <paolo.carlini@oracle.com> 2017-01-16 Paolo Carlini <paolo.carlini@oracle.com>