RFR: 8325730: StringBuilder.toString allocation for the empty String [v2]

[Claes Redestad]

On Tue, 20 Feb 2024 18:08:11 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> I couldn't figure out why we'd want to have `String::substring` micros in a test `StringBuffers` (there's also a `StringSubstring` micro), though I could deal with that as an explicit cleanup RFE.
>
> Yeah, I would like to keep this change clean for backports. Do the cleanup in a separate PR?

Reverted.

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PR Review Comment: https://git.openjdk.org/jdk/pull/17931#discussion_r1496281834