[turbofan] Rip out the unused OsrGuard node.

src/compiler/opcodes.h

 // Copyright 2013 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.
 
 #ifndef V8_COMPILER_OPCODES_H_
 #define V8_COMPILER_OPCODES_H_
 
 #include <iosfwd>
 
 #include "src/globals.h"
@@ skipping 48 matching lines @@
   V(FrameState)             \
   V(StateValues)            \
   V(TypedStateValues)       \
   V(ArgumentsElementsState) \
   V(ArgumentsLengthState)   \
   V(ObjectState)            \
   V(TypedObjectState)       \
   V(Call)                   \
   V(Parameter)              \
   V(OsrValue)               \
-  V(OsrGuard)               \
   V(LoopExit)               \
   V(LoopExitValue)          \
   V(LoopExitEffect)         \
   V(Projection)             \
   V(Retain)                 \
   V(TypeGuard)
 
 #define COMMON_OP_LIST(V) \
   CONSTANT_OP_LIST(V)     \
   INNER_OP_LIST(V)        \
@@ skipping 751 matching lines @@
   }
 };
 
 V8_EXPORT_PRIVATE std::ostream& operator<<(std::ostream&, IrOpcode::Value);
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_OPCODES_H_