[turbofan] Introduce DeadValue and DeadEffect operators.

src/compiler/common-operator.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 "src/compiler/common-operator.h"
 
 #include "src/assembler.h"
 #include "src/base/lazy-instance.h"
 #include "src/compiler/linkage.h"
 #include "src/compiler/opcodes.h"
@@ skipping 98 matching lines @@
 
 
 std::ostream& operator<<(std::ostream& os, ParameterInfo const& i) {
   if (i.debug_name()) os << i.debug_name() << '#';
   os << i.index();
   return os;
 }
 
 
 #define CACHED_OP_LIST(V)                                  \
-  V(Dead, Operator::kFoldable, 0, 0, 0, 0, 0, 1)           \
+  V(DeadValue, Operator::kPure, 0, 0, 0, 1, 0, 0)          \
+  V(DeadEffect, Operator::kPure, 0, 0, 0, 0, 1, 0)         \
+  V(DeadControl, Operator::kFoldable, 0, 0, 0, 0, 0, 1)    \
   V(IfTrue, Operator::kKontrol, 0, 0, 1, 0, 0, 1)          \
   V(IfFalse, Operator::kKontrol, 0, 0, 1, 0, 0, 1)         \
   V(IfSuccess, Operator::kKontrol, 0, 0, 1, 0, 0, 1)       \
   V(IfDefault, Operator::kKontrol, 0, 0, 1, 0, 0, 1)       \
   V(Throw, Operator::kKontrol, 1, 1, 1, 0, 0, 1)           \
   V(Deoptimize, Operator::kNoThrow, 1, 1, 1, 0, 0, 1)      \
   V(Return, Operator::kNoThrow, 1, 1, 1, 0, 0, 1)          \
   V(Terminate, Operator::kKontrol, 0, 1, 1, 0, 0, 1)       \
   V(OsrNormalEntry, Operator::kFoldable, 0, 1, 1, 0, 1, 1) \
   V(OsrLoopEntry, Operator::kFoldable, 0, 1, 1, 0, 1, 1)
@@ skipping 642 matching lines @@
   } else {
     UNREACHABLE();
     return nullptr;
   }
 }
 
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8