[RFA] Structure and simplify record log in record.c

[Michael Snyder]

Hui Zhu wrote:
> Thanks Michaael and Joel,
> 
> I think the other part of this patch is OK with me.
> 
> But you still has 2 patches "[RFA] Fix off-by-one error in record.c
> (record_list_release_first)" and "[RFA] Expand "info record" will
> change the code of record list.
> So maybe this patch need some update according to these patches.

Don't worry -- it's my responsibility to keep it in sync.
Committed as below, with Joel's suggestions and sync
(test suites passed on x86).


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