Revert of [turbofan] Introduce CheckUnless.

src/compiler/effect-control-linearizer.cc

Index: src/compiler/effect-control-linearizer.cc
diff --git a/src/compiler/effect-control-linearizer.cc b/src/compiler/effect-control-linearizer.cc
index d59869fdafb2aa7a8b39cffb5a0db055e2de58f6..e867a7c5dc785df9203935c03b7f41453f3c39f1 100644
--- a/src/compiler/effect-control-linearizer.cc
+++ b/src/compiler/effect-control-linearizer.cc
@@ -458,9 +458,6 @@
     case IrOpcode::kCheckIf:
       state = LowerCheckIf(node, frame_state, *effect, *control);
       break;
-    case IrOpcode::kCheckUnless:
-      state = LowerCheckUnless(node, frame_state, *effect, *control);
-      break;
     case IrOpcode::kCheckFloat64Hole:
       state = LowerCheckFloat64Hole(node, frame_state, *effect, *control);
       break;
@@ -1335,17 +1332,6 @@
 }
 
 EffectControlLinearizer::ValueEffectControl
-EffectControlLinearizer::LowerCheckUnless(Node* node, Node* frame_state,
-                                          Node* effect, Node* control) {
-  NodeProperties::ReplaceEffectInput(node, effect);
-  NodeProperties::ReplaceControlInput(node, control);
-  DCHECK_NOT_NULL(frame_state);
-  node->InsertInput(graph()->zone(), 1, frame_state);
-  NodeProperties::ChangeOp(node, common()->DeoptimizeUnless());
-  return ValueEffectControl(node, node, node);
-}
-
-EffectControlLinearizer::ValueEffectControl
 EffectControlLinearizer::LowerCheckFloat64Hole(Node* node, Node* frame_state,
                                                Node* effect, Node* control) {
   // If we reach this point w/o eliminating the {node} that's marked