[turbofan] Properly connect DeoptimizeIf/Unless to effect chain.

src/compiler/common-operator-reducer.cc

Index: src/compiler/common-operator-reducer.cc
diff --git a/src/compiler/common-operator-reducer.cc b/src/compiler/common-operator-reducer.cc
index 2f486833c609c464d2995f466283ff42788b9c30..a6d275fd4e909db98b4358acd61ae5a2e4652f86 100644
--- a/src/compiler/common-operator-reducer.cc
+++ b/src/compiler/common-operator-reducer.cc
@@ -142,13 +142,14 @@ Reduction CommonOperatorReducer::ReduceDeoptimizeConditional(Node* node) {
   Decision const decision = DecideCondition(condition);
   if (decision == Decision::kUnknown) return NoChange();
   if (condition_is_true == (decision == Decision::kTrue)) {
-    return Replace(control);
+    ReplaceWithValue(node, dead(), effect, control);
+  } else {
+    control = graph()->NewNode(common()->Deoptimize(DeoptimizeKind::kEager),
+                               frame_state, effect, control);
+    // TODO(bmeurer): This should be on the AdvancedReducer somehow.
+    NodeProperties::MergeControlToEnd(graph(), common(), control);
+    Revisit(graph()->end());
   }
-  control = graph()->NewNode(common()->Deoptimize(DeoptimizeKind::kEager),
-                             frame_state, effect, control);
-  // TODO(bmeurer): This should be on the AdvancedReducer somehow.
-  NodeProperties::MergeControlToEnd(graph(), common(), control);
-  Revisit(graph()->end());
   return Replace(dead());
 }