BranchFolding.cpp

        }
      }
      
      // Okay, there is no really great place to put this block.  If, however,
      // the block before this one would be a fall-through if this block were
      // removed, move this block to the end of the function.
      if (FallThrough != MBB->getParent()->end() &&
          PrevBB.isSuccessor(FallThrough)) {
        MBB->moveAfter(--MBB->getParent()->end());
        MadeChange = true;
        return;
      }
    }
  }
}