[crac] RFR: 8371337: [CRaC] Fastdebug build fails when calling OperatingSystemMxBean.getProcessCpuLoad after restore [v2]

[Radim Vansa]

> A JVM that executed OperatingSystemImpl.getProcessCpuLoad()  before checkpoint can fail with assertion failure after restore with:
> 
> java: /home/rvansa/work/zulu/src/jdk.management/linux/native/libmanagement_ext/UnixOperatingSystem.c:291: get_cpuload_internal: Assertion `pticks->usedKernel >= tmp.usedKernel' failed.
> 
> This is an assertion failure, therefore failing only in debug builds, and providing probably a non-sense value in release builds. We should remove the assertion and return a negative value (documented as value for ‘unavailable’) if this is detected.

Radim Vansa has updated the pull request incrementally with one additional commit since the last revision:

  Check all partial counters

-------------

Changes:
  - all: https://git.openjdk.org/crac/pull/274/files
  - new: https://git.openjdk.org/crac/pull/274/files/284b7130..23d66dda

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=crac&pr=274&range=01
 - incr: https://webrevs.openjdk.org/?repo=crac&pr=274&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/crac/pull/274.diff
  Fetch: git fetch https://git.openjdk.org/crac.git pull/274/head:pull/274

PR: https://git.openjdk.org/crac/pull/274