[turbofan] Add DebugBreak machine operator and support

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 623 matching lines @@
 
     case IrOpcode::kJSLoadMessage:
     case IrOpcode::kJSStoreMessage:
       break;
 
     case IrOpcode::kJSStackCheck:
       // Type is empty.
       CheckNotTyped(node);
       break;
 
+    case IrOpcode::kDebugBreak:
+      CheckNotTyped(node);
+      break;
+
     // Simplified operators
     // -------------------------------
     case IrOpcode::kBooleanNot:
       // Boolean -> Boolean
       CheckValueInputIs(node, 0, Type::Boolean());
       CheckUpperIs(node, Type::Boolean());
       break;
     case IrOpcode::kBooleanToNumber:
       // Boolean -> Number
       CheckValueInputIs(node, 0, Type::Boolean());
@@ skipping 711 matching lines @@
          replacement->op()->EffectOutputCount() > 0);
   DCHECK(!NodeProperties::IsFrameStateEdge(edge) ||
          replacement->opcode() == IrOpcode::kFrameState);
 }
 
 #endif  // DEBUG
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8