Ensure that public callable parameters are valid for calldata.

libsolidity/ast/AST.h

@@ -914,6 +914,8 @@ public:
 	/// @returns true if this variable is a parameter (not return parameter) of an external function.
 	/// This excludes parameters of external function type names.
 	bool isExternalCallableParameter() const;
+	/// @returns true if this variable is a parameter (not return parameter) of a public function.
+	bool isPublicCallableParameter() const;
 	/// @returns true if this variable is a parameter or return parameter of an internal function
 	/// or a function type of internal visibility.
 	bool isInternalCallableParameter() const;