[turbofan] Add NewUnmappedArgumentsElements and NewRestParametersArguments.

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 5dcb37fae83f3b098278c203a7d4823c6d259314..5c583ae90ffb65253f314b45690edceb12a9b48d 100644
--- a/src/compiler/simplified-lowering.cc
+++ b/src/compiler/simplified-lowering.cc
@@ -2489,6 +2489,12 @@ class RepresentationSelector {
         VisitObjectIs(node, Type::Undetectable(), lowering);
         return;
       }
+      case IrOpcode::kNewRestParameterElements:
+      case IrOpcode::kNewUnmappedArgumentsElements: {
+        ProcessRemainingInputs(node, 0);
+        SetOutput(node, MachineRepresentation::kTaggedPointer);
+        return;
+      }
       case IrOpcode::kArrayBufferWasNeutered: {
         VisitUnop(node, UseInfo::AnyTagged(), MachineRepresentation::kBit);
         return;