[turbofan] Turn common Guard operator into simplified TypeGuard.

src/compiler/simplified-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_SIMPLIFIED_OPERATOR_H_
 #define V8_COMPILER_SIMPLIFIED_OPERATOR_H_
 
 #include <iosfwd>
 
 #include "src/handles.h"
@@ skipping 84 matching lines @@
 
 bool operator==(ElementAccess const&, ElementAccess const&);
 bool operator!=(ElementAccess const&, ElementAccess const&);
 
 size_t hash_value(ElementAccess const&);
 
 std::ostream& operator<<(std::ostream&, ElementAccess const&);
 
 ElementAccess const& ElementAccessOf(const Operator* op) WARN_UNUSED_RESULT;
 
+Type* TypeOf(const Operator* op) WARN_UNUSED_RESULT;
 
 // Interface for building simplified operators, which represent the
 // medium-level operations of V8, including adding numbers, allocating objects,
 // indexing into objects and arrays, etc.
 // All operators are typed but many are representation independent.
 
 // Number values from JS can be in one of these representations:
 //   - Tagged: word-sized integer that is either
 //     - a signed small integer (31 or 32 bits plus a tag)
 //     - a tagged pointer to a HeapNumber object that has a float64 field
@@ skipping 60 matching lines @@
   const Operator* ChangeBitToTagged();
   const Operator* TruncateTaggedToWord32();
 
   const Operator* ObjectIsCallable();
   const Operator* ObjectIsNumber();
   const Operator* ObjectIsReceiver();
   const Operator* ObjectIsSmi();
   const Operator* ObjectIsString();
   const Operator* ObjectIsUndetectable();
 
+  const Operator* TypeGuard(Type* type);
+
   const Operator* Allocate(PretenureFlag pretenure = NOT_TENURED);
 
   const Operator* LoadField(FieldAccess const&);
   const Operator* StoreField(FieldAccess const&);
 
   // load-buffer buffer, offset, length
   const Operator* LoadBuffer(BufferAccess);
 
   // store-buffer buffer, offset, length, value
   const Operator* StoreBuffer(BufferAccess);
@@ skipping 11 matching lines @@
   Zone* const zone_;
 
   DISALLOW_COPY_AND_ASSIGN(SimplifiedOperatorBuilder);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_SIMPLIFIED_OPERATOR_H_