[turbofan] Make arguments object materialization inlinable.

src/compiler/js-operator.cc

Index: src/compiler/js-operator.cc
diff --git a/src/compiler/js-operator.cc b/src/compiler/js-operator.cc
index 975ca0c5b18be8009b049ef43ebac92bb2c56803..e7de5ee585332aec3498989692fb6def3fbfcafa 100644
--- a/src/compiler/js-operator.cc
+++ b/src/compiler/js-operator.cc
@@ -413,6 +413,13 @@ std::ostream& operator<<(std::ostream& os, CreateArgumentsParameters const& p) {
 }
 
 
+const CreateArgumentsParameters& CreateArgumentsParametersOf(
+    const Operator* op) {
+  DCHECK_EQ(IrOpcode::kJSCreateArguments, op->opcode());
+  return OpParameter<CreateArgumentsParameters>(op);
+}
+
+
 bool operator==(CreateClosureParameters const& lhs,
                 CreateClosureParameters const& rhs) {
   return lhs.pretenure() == rhs.pretenure() &&