[turbofan] Introduce a dedicated ConvertTaggedHoleToUndefined operator.

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 1024 matching lines @@
     case IrOpcode::kCheckedTaggedToFloat64:
     case IrOpcode::kCheckedTruncateTaggedToWord32:
       break;
 
     case IrOpcode::kCheckFloat64Hole:
       CheckValueInputIs(node, 0, Type::Number());
       CheckUpperIs(node, Type::Number());
       break;
     case IrOpcode::kCheckTaggedHole:
       CheckValueInputIs(node, 0, Type::Any());
-      CheckUpperIs(node, Type::Any());
+      CheckUpperIs(node, Type::NonInternal());
+      break;
+    case IrOpcode::kConvertTaggedHoleToUndefined:
+      CheckValueInputIs(node, 0, Type::Any());
+      CheckUpperIs(node, Type::NonInternal());
       break;
 
     case IrOpcode::kLoadField:
       // Object -> fieldtype
       // TODO(rossberg): activate once machine ops are typed.
       // CheckValueInputIs(node, 0, Type::Object());
       // CheckUpperIs(node, FieldAccessOf(node->op()).type));
       break;
     case IrOpcode::kLoadBuffer:
       break;
@@ skipping 520 matching lines @@
          replacement->op()->EffectOutputCount() > 0);
   DCHECK(!NodeProperties::IsFrameStateEdge(edge) ||
          replacement->opcode() == IrOpcode::kFrameState);
 }
 
 #endif  // DEBUG
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8