[turbofan] Remove obsolete TODO in EffectControlLinearizer.

R=tebbi@chromium.org

Change-Id: Idd7b1de0a769b3a069e0b539cccb9c3f9820b4bd
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1883556
Auto-Submit: Michael Starzinger <mstarzinger@chromium.org>
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64586}

src/compiler/effect-control-linearizer.cc

@@ -670,8 +670,6 @@ void EffectControlLinearizer::Run() {
     // The frame state at block entry is determined by the frame states leaving
     // all predecessors. In case there is no frame state dominating this block,
     // we can rely on a checkpoint being present before the next deoptimization.
-    // TODO(mstarzinger): Eventually we will need to go hunt for a frame state
-    // once deoptimizing nodes roam freely through the schedule.
     Node* frame_state = nullptr;
     if (block != schedule()->start()) {
       // If all the predecessors have the same effect, we can use it