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

[Ilarion Nakonechnyy]

On Wed, 10 Aug 2022 17:36:38 GMT, Anton Kozlov <akozlov at openjdk.org> wrote:

>> 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.
>
> src/hotspot/os/linux/os_linux.cpp line 5731:
> 
>> 5729: 
>> 5730: static void print_resources(outputStream * ostream, const char* msg, ... ) {
>> 5731:   outputStream * ou = (ostream == NULL) ? tty : ostream;
> 
> You can probably move this check into VM_Crac, then get rid of these helper functions as trivial ones

Moved the output stream selection into VM_Crac constructor, but propose still use these functions for hiding check on `CRPrintResourcesOnCheckpoint`,  `CRTrace`.

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