[turbofan] Handle impossible types (Type::None()) in the backend.

src/compiler/verifier.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/verifier.h"
 
 #include <algorithm>
 #include <deque>
 #include <queue>
 #include <sstream>
@@ skipping 928 matching lines @@
     }
     case IrOpcode::kTruncateTaggedToWord32: {
       // Number /\ Tagged -> Signed32 /\ UntaggedInt32
       // TODO(neis): Activate once ChangeRepresentation works in typer.
       // Type* from = Type::Intersect(Type::Number(), Type::Tagged());
       // Type* to = Type::Intersect(Type::Number(), Type::UntaggedInt32());
       // CheckValueInputIs(node, 0, from));
       // CheckUpperIs(node, to));
       break;
     }
+    case IrOpcode::kImpossibleToWord32:
+    case IrOpcode::kImpossibleToWord64:
+    case IrOpcode::kImpossibleToFloat32:
+    case IrOpcode::kImpossibleToFloat64:
+    case IrOpcode::kImpossibleToTagged:
+    case IrOpcode::kImpossibleToBit:
+      break;
 
     case IrOpcode::kCheckBounds:
       CheckValueInputIs(node, 0, Type::Any());
       CheckValueInputIs(node, 1, Type::Unsigned31());
       CheckUpperIs(node, Type::Unsigned31());
       break;
     case IrOpcode::kCheckNumber:
       CheckValueInputIs(node, 0, Type::Any());
       CheckUpperIs(node, Type::Number());
       break;
@@ skipping 556 matching lines @@
          replacement->op()->EffectOutputCount() > 0);
   DCHECK(!NodeProperties::IsFrameStateEdge(edge) ||
          replacement->opcode() == IrOpcode::kFrameState);
 }
 
 #endif  // DEBUG
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8