[turbofan] Rip out the unused OsrGuard node.

src/compiler/common-operator.h

 // 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.
 
 #ifndef V8_COMPILER_COMMON_OPERATOR_H_
 #define V8_COMPILER_COMMON_OPERATOR_H_
 
 #include "src/assembler.h"
 #include "src/base/compiler-specific.h"
 #include "src/compiler/frame-states.h"
@@ skipping 269 matching lines @@
 
 RegionObservability RegionObservabilityOf(Operator const*) WARN_UNUSED_RESULT;
 
 std::ostream& operator<<(std::ostream& os,
                          const ZoneVector<MachineType>* types);
 
 Type* TypeGuardTypeOf(Operator const*) WARN_UNUSED_RESULT;
 
 int OsrValueIndexOf(Operator const*);
 
-enum class OsrGuardType { kUninitialized, kSignedSmall, kAny };
-size_t hash_value(OsrGuardType type);
-std::ostream& operator<<(std::ostream&, OsrGuardType);
-OsrGuardType OsrGuardTypeOf(Operator const*);
-
 SparseInputMask SparseInputMaskOf(Operator const*);
 
 ZoneVector<MachineType> const* MachineTypesOf(Operator const*)
     WARN_UNUSED_RESULT;
 
 // The ArgumentsElementsState and ArgumentsLengthState can either describe an
 // unmapped arguments backing store or the backing store of the rest parameters.
 // IsRestOf(op) is true in the second case.
 bool IsRestOf(Operator const*);
 
@@ skipping 25 matching lines @@
   const Operator* Terminate();
 
   const Operator* Start(int value_output_count);
   const Operator* Loop(int control_input_count);
   const Operator* Merge(int control_input_count);
   const Operator* Parameter(int index, const char* debug_name = nullptr);
 
   const Operator* OsrNormalEntry();
   const Operator* OsrLoopEntry();
   const Operator* OsrValue(int index);
-  const Operator* OsrGuard(OsrGuardType type);
 
   const Operator* Int32Constant(int32_t);
   const Operator* Int64Constant(int64_t);
   const Operator* Float32Constant(volatile float);
   const Operator* Float64Constant(volatile double);
   const Operator* ExternalConstant(const ExternalReference&);
   const Operator* NumberConstant(volatile double);
   const Operator* PointerConstant(intptr_t);
   const Operator* HeapConstant(const Handle<HeapObject>&);
 
@@ skipping 45 matching lines @@
   Zone* const zone_;
 
   DISALLOW_COPY_AND_ASSIGN(CommonOperatorBuilder);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_COMMON_OPERATOR_H_