RFR: 8313768: Reduce interaction with volatile field in j.u.l.StreamHandler

[Jaikiran Pai]

On Fri, 4 Aug 2023 14:51:35 GMT, Sergey Tsypanov <stsypanov at openjdk.org> wrote:

> In `publish0()`, `flush0()` and `flushAndClose()`methods of `StreamHandler` we read multiple times from volatile writer. The access number can be reduced by reading the field into local variable once.

The change looks fine to me. 

I have triggered a CI run and will sponsor once that completes (I don't expect any regressions here given the nature of this change).

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Marked as reviewed by jpai (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/15161#pullrequestreview-1568845719