[turbofan] Introduce DeadValue and DeadEffect operators.

test/unittests/compiler/graph-reducer-unittest.cc

Index: test/unittests/compiler/graph-reducer-unittest.cc
diff --git a/test/unittests/compiler/graph-reducer-unittest.cc b/test/unittests/compiler/graph-reducer-unittest.cc
index 2d54e21442d36c6c56d3f4bb4912d0eb8e1fe0be..a8e003d013166e9cdc09de7772ecd04be8a9fa56 100644
--- a/test/unittests/compiler/graph-reducer-unittest.cc
+++ b/test/unittests/compiler/graph-reducer-unittest.cc
@@ -275,11 +275,11 @@ struct ReplaceWithValueReducer final : public AdvancedReducer {
   using AdvancedReducer::ReplaceWithValue;
 };
 
-const Operator kMockOperator(IrOpcode::kDead, Operator::kNoProperties,
+const Operator kMockOperator(IrOpcode::kDeadControl, Operator::kNoProperties,
                              "MockOperator", 0, 0, 0, 1, 0, 0);
-const Operator kMockOpEffect(IrOpcode::kDead, Operator::kNoProperties,
+const Operator kMockOpEffect(IrOpcode::kDeadControl, Operator::kNoProperties,
                              "MockOpEffect", 0, 1, 0, 1, 1, 0);
-const Operator kMockOpControl(IrOpcode::kDead, Operator::kNoProperties,
+const Operator kMockOpControl(IrOpcode::kDeadControl, Operator::kNoProperties,
                               "MockOpControl", 0, 0, 1, 1, 0, 1);
 
 const IfExceptionHint kNoHint = IfExceptionHint::kLocallyCaught;