[turbofan] Remove unused code

src/compiler/escape-analysis.cc

 // Copyright 2015 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/escape-analysis.h"
 
 #include <limits>
 
 #include "src/base/flags.h"
 #include "src/bootstrapper.h"
@@ skipping 1026 matching lines @@
 #ifdef DEBUG
   if (node->opcode() != IrOpcode::kLoadField &&
       node->opcode() != IrOpcode::kLoadElement &&
       node->opcode() != IrOpcode::kLoad && IsDanglingEffectNode(node)) {
     PrintF("Dangeling effect node: #%d (%s)\n", node->id(),
            node->op()->mnemonic());
     UNREACHABLE();
   }
 #endif  // DEBUG
   Node* effect = NodeProperties::GetEffectInput(node);
-  // Break the cycle for effect phis.
-  if (effect->opcode() == IrOpcode::kEffectPhi &&
-      virtual_states_[effect->id()] == nullptr) {
-    VirtualState* state =
-        new (zone()) VirtualState(effect, zone(), AliasCount());
-    virtual_states_[effect->id()] = state;
-    TRACE("Effect Phi #%d got new virtual state %p.\n", effect->id(),
-          static_cast<void*>(virtual_states_[effect->id()]));
-  }
   DCHECK_NOT_NULL(virtual_states_[effect->id()]);
   if (virtual_states_[node->id()]) {
     virtual_states_[node->id()]->UpdateFrom(virtual_states_[effect->id()],
                                             zone());
   } else {
     virtual_states_[node->id()] = virtual_states_[effect->id()];
     TRACE("Forwarding object state %p from %s#%d to %s#%d",
           static_cast<void*>(virtual_states_[effect->id()]),
           effect->op()->mnemonic(), effect->id(), node->op()->mnemonic(),
           node->id());
@@ skipping 467 matching lines @@
         return true;
       }
     }
   }
   return false;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8