RFR: 8309538: G1: Move total collection increment from Cleanup to Remark

[Thomas Schatzl]

On Tue, 6 Jun 2023 13:37:13 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Simple moving `increment_total_collections` to where empty-region reclaim lives.
> 
> Test: hotspot_gc

Marked as reviewed by tschatzl (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/14334#pullrequestreview-1474907029