RFR 8217342: Build failed with excluding JFR

[Zhengyu Gu]

Please review this patch that fixes build failures when excluding JFR 
(configure build with --with-jvm-features=-jfr)

Bug: https://bugs.openjdk.java.net/browse/JDK-8217342
Webrev: http://cr.openjdk.java.net/~zgu/JDK-8217342/webrev.00/index.html

Test:
   PCH and none PCH builds with/without JFR on Linux x64 (fastdebug and 
release)

Thanks,

-Zhengyu