[turbofan] Introduce an ExternalPointer type.

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 206 matching lines @@
   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>&);
 
   const Operator* RelocatableInt32Constant(int32_t value,
                                            RelocInfo::Mode rmode);
   const Operator* RelocatableInt64Constant(int64_t value,
                                            RelocInfo::Mode rmode);
 
   const Operator* Select(MachineRepresentation, BranchHint = BranchHint::kNone);
   const Operator* Phi(MachineRepresentation representation,
                       int value_input_count);
@@ skipping 34 matching lines @@
   Zone* const zone_;
 
   DISALLOW_COPY_AND_ASSIGN(CommonOperatorBuilder);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_COMMON_OPERATOR_H_