[turbofan] Add re-typing for PlainPrimitiveToNumber during representation inference.

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 439 matching lines @@
         // fail on a boolean. OperationTyper should have a function that
         // computes a more precise type.
         Type* lhs = op_typer_.ToNumber(FeedbackTypeOf(node->InputAt(0)));
         Type* rhs = op_typer_.ToNumber(FeedbackTypeOf(node->InputAt(1)));
         Type* computed_type = op_typer_.NumberModulus(lhs, rhs);
         new_type = Type::Intersect(computed_type, info->restriction_type(),
                                    graph_zone());
         break;
       }
 
+      case IrOpcode::kPlainPrimitiveToNumber:
+        new_type = op_typer_.ToNumber(FeedbackTypeOf(node->InputAt(0)));
+        break;
+
       case IrOpcode::kNumberAbs: {
         new_type = op_typer_.NumberAbs(FeedbackTypeOf(node->InputAt(0)));
         break;
       }
 
       case IrOpcode::kPhi: {
         new_type = TypePhi(node);
         if (type != nullptr) {
           new_type = Weaken(node, type, new_type);
         }
@@ skipping 2872 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