RFR(trivial): JDK-8223651: Build fails with --with-jvm-features=-jfr and --disable-precompiled-headers

[Ao Qi]

Hi,

Bugs:
https://bugs.openjdk.java.net/browse/JDK-8223651

Webrev:
http://cr.openjdk.java.net/~aoqi/8223651/webrev.00/

Some more details please see:
https://mail.openjdk.java.net/pipermail/hotspot-runtime-dev/2019-May/034244.html

Thanks,
Ao Qi