[turbofan] Introduce DeadValue and DeadEffect operators.

test/unittests/compiler/common-operator-unittest.cc

 // 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.
 
 #include <limits>
 
 #include "src/compiler/common-operator.h"
 #include "src/compiler/opcodes.h"
 #include "src/compiler/operator.h"
 #include "src/compiler/operator-properties.h"
@@ skipping 30 matching lines @@
 
 const SharedOperator kSharedOperators[] = {
 #define SHARED(Name, properties, value_input_count, effect_input_count,      \
                control_input_count, value_output_count, effect_output_count, \
                control_output_count)                                         \
   {                                                                          \
     &CommonOperatorBuilder::Name, IrOpcode::k##Name, properties,             \
         value_input_count, effect_input_count, control_input_count,          \
         value_output_count, effect_output_count, control_output_count        \
   }
-    SHARED(Dead, Operator::kFoldable, 0, 0, 0, 0, 0, 1),
     SHARED(IfTrue, Operator::kKontrol, 0, 0, 1, 0, 0, 1),
     SHARED(IfFalse, Operator::kKontrol, 0, 0, 1, 0, 0, 1),
     SHARED(IfSuccess, Operator::kKontrol, 0, 0, 1, 0, 0, 1),
     SHARED(Throw, Operator::kKontrol, 1, 1, 1, 0, 0, 1),
     SHARED(Return, Operator::kNoThrow, 1, 1, 1, 0, 0, 1),
-    SHARED(Terminate, Operator::kKontrol, 0, 1, 1, 0, 0, 1)
+    SHARED(Terminate, Operator::kKontrol, 0, 1, 1, 0, 0, 1),
+    SHARED(DeadValue, Operator::kPure, 0, 0, 0, 1, 0, 0),
+    SHARED(DeadEffect, Operator::kPure, 0, 0, 0, 0, 1, 0),
+    SHARED(DeadControl, Operator::kFoldable, 0, 0, 0, 0, 0, 1)
 #undef SHARED
 };
 
 
 class CommonSharedOperatorTest
     : public TestWithZone,
       public ::testing::WithParamInterface<SharedOperator> {};
 
 }  // namespace
 
@@ skipping 307 matching lines @@
     EXPECT_EQ(arguments + 1, OperatorProperties::GetTotalInputCount(op));
     EXPECT_EQ(0, op->ControlOutputCount());
     EXPECT_EQ(0, op->EffectOutputCount());
     EXPECT_EQ(1, op->ValueOutputCount());
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8