[turbofan] Rip out the unused OsrGuard node.

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 383 matching lines @@
       // Type is an external pointer.
       CheckTypeIs(node, Type::ExternalPointer());
       break;
     case IrOpcode::kOsrValue:
       // OSR values have a value and a control input.
       CHECK_EQ(1, control_count);
       CHECK_EQ(1, input_count);
       // Type is merged from other values in the graph and could be any.
       CheckTypeIs(node, Type::Any());
       break;
-    case IrOpcode::kOsrGuard:
-      // OSR values have a value and a control input.
-      CHECK_EQ(1, value_count);
-      CHECK_EQ(1, effect_count);
-      CHECK_EQ(1, control_count);
-      switch (OsrGuardTypeOf(node->op())) {
-        case OsrGuardType::kUninitialized:
-          CheckTypeIs(node, Type::None());
-          break;
-        case OsrGuardType::kSignedSmall:
-          CheckTypeIs(node, Type::SignedSmall());
-          break;
-        case OsrGuardType::kAny:
-          CheckTypeIs(node, Type::Any());
-          break;
-      }
-      break;
     case IrOpcode::kProjection: {
       // Projection has an input that produces enough values.
       int index = static_cast<int>(ProjectionIndexOf(node->op()));
       Node* input = NodeProperties::GetValueInput(node, 0);
       CHECK_GT(input->op()->ValueOutputCount(), index);
       // Type can be anything.
       // TODO(rossberg): Introduce tuple types for this.
       // TODO(titzer): Convince rossberg not to.
       CheckTypeIs(node, Type::Any());
       break;
@@ skipping 1332 matching lines @@
          replacement->op()->EffectOutputCount() > 0);
   DCHECK(!NodeProperties::IsFrameStateEdge(edge) ||
          replacement->opcode() == IrOpcode::kFrameState);
 }
 
 #endif  // DEBUG
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8