[turbofan] Don't connect regular Phis into the effect chain.

src/compiler/effect-control-linearizer.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/effect-control-linearizer.h"
 
 #include "src/code-factory.h"
 #include "src/compiler/access-builder.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/linkage.h"
@@ skipping 258 matching lines @@
     } else {
       for (Edge edge : phi->use_edges()) {
         Node* control = NodeProperties::GetControlInput(edge.from());
         if (NodeProperties::IsPhi(edge.from())) {
           control = NodeProperties::GetControlInput(control, edge.index());
         }
         DCHECK(control == matcher.IfTrue() || control == matcher.IfFalse());
         edge.UpdateTo((control == matcher.IfTrue()) ? phi_true : phi_false);
       }
     }
-    true_block_data->current_effect = phi_true;
-    false_block_data->current_effect = phi_false;
+    if (phi->opcode() == IrOpcode::kEffectPhi) {
+      true_block_data->current_effect = phi_true;
+      false_block_data->current_effect = phi_false;
+    }
     phi->Kill();
   }
   // Fix up IfTrue and IfFalse and kill all dead nodes.
   if (branch == block->control_input()) {
     true_block_data->current_control = merge_true;
     false_block_data->current_control = merge_false;
   }
   branch->Kill();
   cond->Kill();
   merge->Kill();
@@ skipping 1717 matching lines @@
         isolate(), graph()->zone(), callable.descriptor(), 0, flags,
         Operator::kNoThrow);
     to_number_operator_.set(common()->Call(desc));
   }
   return to_number_operator_.get();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8