[8u-jfr] RFR (S) 8203287: Zero fails to build after JDK-8199712 (Flight Recorder)

[Aleksey Shipilev]

Missing backport:
  https://bugs.openjdk.java.net/browse/JDK-8203287

Zero fails to build, because files are missing and some defines are wrong. Most of that is fixed in
the original backport, so I just needed to adapt it for jfr-8u-incubator. vm_version_ext_zero
required dropping cpu_description support -- it is not available in 8u. Changes in jfrTime.cpp are
already present in 8u backport.

Webrev for jdk8u-jfr-incubator/hotspot:
  https://cr.openjdk.java.net/~shade/8203287/webrev.8u-jfr.01/

I don't think I have push privileges for that repository, so would appreciate sponsorship.

Testing: x86_64 zero build

-- 
Thanks,
-Aleksey