[Bug middle-end/81030] [8 Regression] ICE on valid code at -O1 (only) on x86_64-linux-gnu: verify_flow_info failed

["vries at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81030

--- Comment #6 from Tom de Vries <vries at gcc dot gnu.org> ---
There's a call to compute_outgoing_frequencies in find_many_sub_basic_blocks.

But it's not reached for bb4, because STATE(bb4) == BLOCK_TO_SPLIT, and we
trigger the continue here:
...
        else
          /* If nothing changed, there is no need to create new BBs.  */
          if (EDGE_COUNT (bb->succs) == n_succs[bb->index])
            continue;

        compute_outgoing_frequencies (bb);
      }
...

Commenting out the else clause gets rid of the ICE.