In GCC PR 80226 Than reports a Go frontend crash when compiling a
function that returns multiple zero-sized values.  This patch that he
wrote fixes the problem.  Bootstrapped and ran Go testsuite on
x86_64-pc-linux-gnu.  Committed to mainline.

Ian


2017-03-28  Than McIntosh  <thanm@google.com>

PR go/80226
* go-gcc.cc (Gcc_backend::return_statement): Check for
void_type_node when checking result size.