[Bug go/86535] FreeBSD/PowerPC64 - Building Go Frontend support for gcc 7.3.0 fails

[ian at airs dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86535

--- Comment #23 from Ian Lance Taylor <ian at airs dot com> ---
Look for _kern in runtime.inc.  See what struct it is part of.  The struct is
likely defined in the generated file runtime_sysinfo.go.  You may need to
modify libgo/mkrsysinfo.sh to not add that struct to runtime_sysinfo.go, or you
may need to modify mkrsysinfo.sh to define __usem2.