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

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 7025e0e03f6538d5b15b815d2303f1538e9c48e0..0cc53ed9b48072796dcc8a44757edd3412ca4660 100644
--- a/src/compiler/simplified-lowering.cc
+++ b/src/compiler/simplified-lowering.cc
@@ -457,6 +457,10 @@ class RepresentationSelector {
         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;