* flow.c (find_auto_inc): Verify that we've got a REG before

        peeking at its regno.  Fail, don't abort if we can't find
        the increment of the desired register.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@35443 138bc75d-0d04-0410-961f-82ee72b054a4