RFR: 8367862: debug.cpp: Do not print help message for methods ifdef'd out [v3]

[Aleksey Shipilev]

On Mon, 22 Sep 2025 09:55:23 GMT, Kerem Kat <krk at openjdk.org> wrote:

>> The `help` command in `debug.cpp` was out of date, listing only a fraction of the available functions. This and other commands callable from gdb via `call help()`.
>> 
>> I added all commands to the help message, except `pns2` as it is documented as not being useful when called from gdb.
>> 
>> Also fixed is the message for the conditional `pns` command appearing in PRODUCT builds.
>
> Kerem Kat has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Update src/hotspot/share/utilities/debug.cpp
>   
>   Co-authored-by: Manuel Hässig <manuel at haessig.org>

Marked as reviewed by shade (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/27341#pullrequestreview-3253553018