[crac] RFR: Report checkpoint processing to jcmd [v8]

[Ilarion Nakonechnyy]

> pass output stream from diagnosticCommand.cpp through java code into os_linux.cpp::VM_crac::doit()

Ilarion Nakonechnyy has updated the pull request incrementally with two additional commits since the last revision:

 - corrections
 - corrections

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

Changes:
  - all: https://git.openjdk.org/crac/pull/10/files
  - new: https://git.openjdk.org/crac/pull/10/files/13ed574c..183fbc4c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=crac&pr=10&range=07
 - incr: https://webrevs.openjdk.org/?repo=crac&pr=10&range=06-07

  Stats: 25 lines in 2 files changed: 0 ins; 0 del; 25 mod
  Patch: https://git.openjdk.org/crac/pull/10.diff
  Fetch: git fetch https://git.openjdk.org/crac pull/10/head:pull/10

PR: https://git.openjdk.org/crac/pull/10