[turbofan] Always defer replacement in simplified lowering.

src/compiler/simplified-lowering.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/simplified-lowering.h"
 
 #include <limits>
 
 #include "src/address-map.h"
 #include "src/base/bits.h"
@@ skipping 2084 matching lines @@
     if (node->op()->EffectInputCount() > 0) {
       DCHECK_LT(0, node->op()->ControlInputCount());
       // Disconnect the node from effect and control chains.
       Node* control = NodeProperties::GetControlInput(node);
       Node* effect = NodeProperties::GetEffectInput(node);
       ReplaceEffectControlUses(node, effect, control);
     } else {
       DCHECK_EQ(0, node->op()->ControlInputCount());
     }
 
-    if (replacement->id() < count_ &&
-        GetUpperBound(node)->Is(GetUpperBound(replacement)) &&
-        TypeOf(node)->Is(TypeOf(replacement))) {
-      // Replace with a previously existing node eagerly only if the type is the
-      // same.
-      node->ReplaceUses(replacement);
-    } else {
-      // Otherwise, we are replacing a node with a representation change.
-      // Such a substitution must be done after all lowering is done, because
-      // changing the type could confuse the representation change
-      // insertion for uses of the node.
-      replacements_.push_back(node);
-      replacements_.push_back(replacement);
-    }
+    replacements_.push_back(node);
+    replacements_.push_back(replacement);
+
     node->NullAllInputs();  // Node is now dead.
   }
 
   void PrintOutputInfo(NodeInfo* info) {
     if (FLAG_trace_representation) {
       OFStream os(stdout);
       os << info->representation();
     }
   }
 
@@ skipping 979 matching lines @@
         isolate(), graph()->zone(), callable.descriptor(), 0, flags,
         Operator::kNoProperties);
     to_number_operator_.set(common()->Call(desc));
   }
   return to_number_operator_.get();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8