B::Concise: send -stash member name output to the walk handle

[tonycoz]

Fixes #24024

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• This set of changes requires a perldelta entry, and it is included.

[tonycoz]

I wonder if it's worth providing a mechanism to extract lexical and anonymous subs, I've done it at:

https://github.com/tonycoz/compiler-explorer/blob/c4002e590538caa0ab4792473766337e5dbb9add/etc/scripts/disasms/diswrapper.pm#L58-L106

but I'm not sure how that could be made visible in B::Concise itself.