[crac] RFR: Report checkpoint processing to jcmd [v21]

[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:

 - implement checkpointRestoreLocked
 - Revert "java core crac corections"
   
   This reverts commit 6a2b03b77f1ee4e6d48a120a14694d8dff9dbf39.

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

Changes:
  - all: https://git.openjdk.org/crac/pull/10/files
  - new: https://git.openjdk.org/crac/pull/10/files/6a2b03b7..c58902f3

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=crac&pr=10&range=20
 - incr: https://webrevs.openjdk.org/?repo=crac&pr=10&range=19-20

  Stats: 43 lines in 1 file changed: 25 ins; 16 del; 2 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