[turbofan] Introduce CheckIf simplified operator.

src/compiler/node-matchers.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_NODE_MATCHERS_H_
 #define V8_COMPILER_NODE_MATCHERS_H_
 
 #include <cmath>
 
 // TODO(turbofan): Move ExternalReference out of assembler.h
@@ skipping 154 matching lines @@
 typedef FloatMatcher<float, IrOpcode::kFloat32Constant> Float32Matcher;
 typedef FloatMatcher<double, IrOpcode::kFloat64Constant> Float64Matcher;
 typedef FloatMatcher<double, IrOpcode::kNumberConstant> NumberMatcher;
 
 
 // A pattern matcher for heap object constants.
 struct HeapObjectMatcher final
     : public ValueMatcher<Handle<HeapObject>, IrOpcode::kHeapConstant> {
   explicit HeapObjectMatcher(Node* node)
       : ValueMatcher<Handle<HeapObject>, IrOpcode::kHeapConstant>(node) {}
+
+  bool Is(Handle<HeapObject> const& value) const {
+    return this->HasValue() && this->Value().address() == value.address();
+  }
 };
 
 
 // A pattern matcher for external reference constants.
 struct ExternalReferenceMatcher final
     : public ValueMatcher<ExternalReference, IrOpcode::kExternalConstant> {
   explicit ExternalReferenceMatcher(Node* node)
       : ValueMatcher<ExternalReference, IrOpcode::kExternalConstant>(node) {}
   bool Is(const ExternalReference& value) const {
     return this->HasValue() && this->Value() == value;
@@ skipping 425 matching lines @@
   Node* branch_;
   Node* if_true_;
   Node* if_false_;
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_NODE_MATCHERS_H_