PR go/78172.

	PR go/78172.
    libgo: avoid confusion in upcase_fields in mksysinfo.sh

    The mksysinfo.sh script could get confused when there were multiple
    types starting with the same name.  I believe this is the underlying
    cause of GCC PR 78172.

    Also redirect a grep to /dev/null to avoid extraneous messages during
    the build.

    Reviewed-on: https://go-review.googlesource.com/32821

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@241868 138bc75d-0d04-0410-961f-82ee72b054a4