Fix PersistentVector prototype

Author: moiseev

validation-test/stdlib/Prototypes/PersistentVector.swift.gyb

@@ -1,6 +1,6 @@
 // RUN: %empty-directory(%t)
 // RUN: %gyb %s -o %t/PersistentVector.swift
-// RUN: %line-directive %t/PersistentVector.swift -- %target-build-swift -parse-stdlib %t/PersistentVector.swift -o %t/a.out
+// RUN: %line-directive %t/PersistentVector.swift -- %target-build-swift -parse-stdlib -Xfrontend -disable-access-control %t/PersistentVector.swift -o %t/a.out
 // RUN: %target-codesign %t/a.out
 // RUN: %line-directive %t/PersistentVector.swift -- %target-run %t/a.out
 // REQUIRES: executable_test