RFR: JDK-8223599: minimal build failed after JDK-8185525

[Wang Haomin]

Hi,

Bug: https://bugs.openjdk.java.net/browse/JDK-8223599
Webrev: http://cr.openjdk.java.net/~aoqi/8223599/webrev.00/

Build is failed when using --with-jvm-features=-jfr. Would anyone review 
the fix?

Thanks,
Haomin