RFR: 8311639: Replace currentTimeMillis() with nanoTime() in jtreg/gc

[Leo Korinth]

On Fri, 18 Aug 2023 09:06:15 GMT, Leo Korinth <lkorinth at openjdk.org> wrote:

>> It is not to calculate elapsed time. It is to create a unique(ish) key for a hash table. The new code does not guarantee a unique value, but then neither did the old.
>
> I could possibly add some characters to the key if that is what bothers you. I could of course also use `currentTimeMillis` as it is nothing wrong with it. But I would prefer removing `currentTimeMillis` in all gc testing.

I will try to see if I can do it without using time at all.

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PR Review Comment: https://git.openjdk.org/jdk/pull/15331#discussion_r1298220026