[turbofan] Introduce CheckIf node (deopt without explicit frame state).

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 260 matching lines @@
       CheckNotTyped(node);
       break;
     case IrOpcode::kLoop:
     case IrOpcode::kMerge:
       CHECK_EQ(control_count, input_count);
       // Type is empty.
       CheckNotTyped(node);
       break;
     case IrOpcode::kDeoptimizeIf:
     case IrOpcode::kDeoptimizeUnless:
+    case IrOpcode::kCheckIf:
       // Type is empty.
       CheckNotTyped(node);
       break;
     case IrOpcode::kDeoptimize:
     case IrOpcode::kReturn:
     case IrOpcode::kThrow:
       // Deoptimize, Return and Throw uses are End.
       for (const Node* use : node->uses()) {
         CHECK_EQ(IrOpcode::kEnd, use->opcode());
       }
@@ skipping 1118 matching lines @@
          replacement->op()->EffectOutputCount() > 0);
   DCHECK(!NodeProperties::IsFrameStateEdge(edge) ||
          replacement->opcode() == IrOpcode::kFrameState);
 }
 
 #endif  // DEBUG
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8