Add UseMemoDirective and UseNoMemoDirective classes

javascript/ql/lib/semmle/javascript/Stmt.qll

@@ -435,6 +435,32 @@ module Directive {
     UseClientDirective() { this.getDirectiveText() = "use client" }
   }
 
+  /**
+   * A `use memo` directive.
+   *
+   * Example:
+   *
+   * ```
+   * "use memo";
+   * ```
+   */
+  class UseMemoDirective extends KnownDirective {
+    UseMemoDirective() { this.getDirectiveText() = "use memo" }
+  }
+
+  /**
+   * A `use no memo` directive.
+   *
+   * Example:
+   *
+   * ```
+   * "use no memo";
+   * ```
+   */
+  class UseNoMemoDirective extends KnownDirective {
+    UseNoMemoDirective() { this.getDirectiveText() = "use no memo" }
+  }
+
   /**
    * A `use cache` directive.
    *