[turbofan] Always defer replacement in simplified lowering.

src/compiler/simplified-lowering.cc

Index: src/compiler/simplified-lowering.cc
diff --git a/src/compiler/simplified-lowering.cc b/src/compiler/simplified-lowering.cc
index b36b777224b4fb949fc5eee5216ac462b2d2299b..a6717fb1001847a1585e96c3119bcc3132201442 100644
--- a/src/compiler/simplified-lowering.cc
+++ b/src/compiler/simplified-lowering.cc
@@ -2102,20 +2102,9 @@ class RepresentationSelector {
       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.
   }