[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 e867a7c5dc785df9203935c03b7f41453f3c39f1..d59869fdafb2aa7a8b39cffb5a0db055e2de58f6 100644
--- a/src/compiler/effect-control-linearizer.cc
+++ b/src/compiler/effect-control-linearizer.cc
@@ -458,6 +458,9 @@ bool EffectControlLinearizer::TryWireInStateEffect(Node* node,
     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;
@@ -1332,6 +1335,17 @@ EffectControlLinearizer::LowerCheckIf(Node* node, Node* frame_state,
 }
 
 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