[turbofan] Model arguments object materialization in graph.

src/compiler/ast-graph-builder.cc

Index: src/compiler/ast-graph-builder.cc
diff --git a/src/compiler/ast-graph-builder.cc b/src/compiler/ast-graph-builder.cc
index 52d4a470f6f52955c6c916b3b973017e17a5b05b..d30910b1821ea61d616fb3fe34b1cfdd43432a7e 100644
--- a/src/compiler/ast-graph-builder.cc
+++ b/src/compiler/ast-graph-builder.cc
@@ -3152,7 +3152,11 @@ Node* AstGraphBuilder::BuildArgumentsObject(Variable* arguments) {
 
   // Allocate and initialize a new arguments object.
   Node* callee = GetFunctionClosure();
-  const Operator* op = javascript()->CallRuntime(Runtime::kNewArguments, 1);
+  CreateArgumentsParameters::Type type =
+      is_strict(language_mode()) || !info()->has_simple_parameters()
+          ? CreateArgumentsParameters::UNMAPPED_ARGUMENTS
+          : CreateArgumentsParameters::MAPPED_ARGUMENTS;
+  const Operator* op = javascript()->CreateArguments(type, 0);
   Node* object = NewNode(op, callee);
 
   // Assign the object to the arguments variable.