[turbofan] Avoid going through ArgumentsAdaptorTrampoline for CSA/C++ builtins

src/code-stub-assembler.h

Index: src/code-stub-assembler.h
diff --git a/src/code-stub-assembler.h b/src/code-stub-assembler.h
index 74c23c67f1033633a6698d997b99ebd47597c252..49820c6fb9e4ece43a7ee0991b0148e734986671 100644
--- a/src/code-stub-assembler.h
+++ b/src/code-stub-assembler.h
@@ -1473,6 +1473,8 @@ class CodeStubArguments {
 
   Node* AtIndex(int index) const;
 
+  Node* GetOptionalArgumentValue(int index, Node* default_value);
+
   Node* GetLength() const { return argc_; }
 
   typedef std::function<void(Node* arg)> ForEachBodyFunction;