RFR: 8305767: HdrSeq: support for a merge() method

[William Kemper]

On Fri, 7 Apr 2023 23:03:02 GMT, William Kemper <wkemper at openjdk.org> wrote:

> A merge functionality on stats (distributions) was needed for the remembered set scan that I was using in some companion work. This PR implements a first cut at that, which is sufficient for our first (and only) use case.
> 
> Unfortunately, for expediency, I am deferring work on decaying statistics, as a result of which users that want decaying statistics will get NaNs instead (or trigger guarantees).

We are abandoning this change in favor of https://github.com/openjdk/shenandoah/pull/268 - which doesn't change any shared code.

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PR Comment: https://git.openjdk.org/jdk/pull/13395#issuecomment-1530229190