JDK-8356176 added new printing code for TraceLoopOpts when splitting nodes through a phi but missed a line break:

  if (TraceLoopOpts) {
    tty->print("Split %d %s through %d Phi in %d %s",
               n->_idx, n->Name(), phi->_idx, region->_idx, region->Name());
  }

This will result in:

Split 974 CmpI through 1465 Phi in 953 RegionSplit 474 Bool through 1468 Phi in 953 RegionSplit-If

instead of

Split 974 CmpI through 1465 Phi in 953 RegionSplit 474 Bool through 1468 Phi in 953 Region
Split-If