RFR: 8300769: Remove G1CollectionSet::_inc_bytes_used_before

[Thomas Schatzl]

On Fri, 20 Jan 2023 22:26:19 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> I think `_bytes_used` is enough; the `_before` suffix adds nothing and it's confusing -- there's no counterpart like `_bytes_used_after`.

I considered that, but you could argue that the metric gathered here is "bytes used before" (gc, in the collection set). The "bytes used after" is calculated on the spot when it's needed just before passing it on to JFR.
I'm good either way, if you still think it's better to remove the `_before` or the second reviewer suggests it too, I'll do the rename (in another RFE).

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PR: https://git.openjdk.org/jdk/pull/12113