[turbofan] Introduce TruncateTaggedToBit operator for ToBoolean truncation.

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 975 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));
       // CheckTypeIs(node, to));
       break;
     }
+    case IrOpcode::kTruncateTaggedToBit:
+      break;
+
     case IrOpcode::kCheckBounds:
       CheckValueInputIs(node, 0, Type::Any());
       CheckValueInputIs(node, 1, Type::Unsigned31());
       CheckTypeIs(node, Type::Unsigned31());
       break;
     case IrOpcode::kCheckMaps:
       // (Any, Internal, ..., Internal) -> Any
       CheckValueInputIs(node, 0, Type::Any());
       for (int i = 1; i < node->op()->ValueInputCount(); ++i) {
         CheckValueInputIs(node, i, Type::Internal());
@@ skipping 581 matching lines @@
          replacement->op()->EffectOutputCount() > 0);
   DCHECK(!NodeProperties::IsFrameStateEdge(edge) ||
          replacement->opcode() == IrOpcode::kFrameState);
 }
 
 #endif  // DEBUG
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8