add todo

Author: XChy

llvm/lib/Transforms/Scalar/DFAJumpThreading.cpp

@@ -158,6 +158,7 @@ class DFAJumpThreading {
  void
  unfoldSelectInstrs(DominatorTree *DT,
  const SmallVector<SelectInstToUnfold, 4> &SelectInsts) {
+ // TODO: Have everything use a single lazy DTU
  DomTreeUpdater DTU(DT, DomTreeUpdater::UpdateStrategy::Lazy);
  SmallVector<SelectInstToUnfold, 4> Stack(SelectInsts);