RFR: 8294362: UL: Replace the internal usage of manual buffers with stringStream in LogSelection

[Robbin Ehn]

On Tue, 4 Oct 2022 11:44:26 GMT, Johan Sjölen <jsjolen at openjdk.org> wrote:

> Hi,
> 
> This is only a refactoring where the usage of manual character buffers are replaced with output streams, leading to much simpler code.

Look good.

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Marked as reviewed by rehn (Reviewer).

PR: https://git.openjdk.org/jdk/pull/10553