[turbofan] Use InternalizedString feedback abstract/strict equality comparisons.

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 2235 matching lines @@
         }
         if (lower()) DeferReplacement(node, node->InputAt(0));
         return;
       }
       case IrOpcode::kCheckIf: {
         ProcessInput(node, 0, UseInfo::Bool());
         ProcessRemainingInputs(node, 1);
         SetOutput(node, MachineRepresentation::kNone);
         return;
       }
+      case IrOpcode::kCheckInternalizedString: {
+        if (InputIs(node, Type::InternalizedString())) {
+          VisitUnop(node, UseInfo::AnyTagged(),
+                    MachineRepresentation::kTaggedPointer);
+          if (lower()) DeferReplacement(node, node->InputAt(0));
+        } else {
+          VisitUnop(node, UseInfo::AnyTagged(),
+                    MachineRepresentation::kTaggedPointer);
+        }
+        return;
+      }
       case IrOpcode::kCheckNumber: {
         if (InputIs(node, Type::Number())) {
           if (truncation.IsUsedAsWord32()) {
             VisitUnop(node, UseInfo::TruncatingWord32(),
                       MachineRepresentation::kWord32);
           } else {
             // TODO(jarin,bmeurer): We need to go to Tagged here, because
             // otherwise we cannot distinguish the hole NaN (which might need to
             // be treated as undefined). We should have a dedicated Type for
             // that at some point, and maybe even a dedicated truncation.
@@ skipping 1192 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