[turbofan] Proper dead code elimination as regular reducer.

test/unittests/compiler/node-test-utils.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_UNITTESTS_COMPILER_NODE_TEST_UTILS_H_
 #define V8_UNITTESTS_COMPILER_NODE_TEST_UTILS_H_
 
 #include "src/compiler/machine-operator.h"
 #include "src/compiler/machine-type.h"
 #include "testing/gmock/include/gmock/gmock.h"
@@ skipping 18 matching lines @@
 class CallDescriptor;
 class ContextAccess;
 struct ElementAccess;
 struct FieldAccess;
 class Node;
 
 
 using ::testing::Matcher;
 
 
+Matcher<Node*> IsDead();
 Matcher<Node*> IsEnd(const Matcher<Node*>& control0_matcher);
 Matcher<Node*> IsEnd(const Matcher<Node*>& control0_matcher,
                      const Matcher<Node*>& control1_matcher);
 Matcher<Node*> IsBranch(const Matcher<Node*>& value_matcher,
                         const Matcher<Node*>& control_matcher);
 Matcher<Node*> IsMerge(const Matcher<Node*>& control0_matcher,
                        const Matcher<Node*>& control1_matcher);
 Matcher<Node*> IsMerge(const Matcher<Node*>& control0_matcher,
                        const Matcher<Node*>& control1_matcher,
                        const Matcher<Node*>& control2_matcher);
@@ skipping 219 matching lines @@
 Matcher<Node*> IsLoadContext(const Matcher<ContextAccess>& access_matcher,
                              const Matcher<Node*>& context_matcher);
 Matcher<Node*> IsNumberToInt32(const Matcher<Node*>& input_matcher);
 Matcher<Node*> IsNumberToUint32(const Matcher<Node*>& input_matcher);
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_UNITTESTS_COMPILER_NODE_TEST_UTILS_H_