RFR: JDK-8322512 StringBuffer.repeat does not work correctly after toString() was called [v2]

[Markus KARG]

On Wed, 20 Dec 2023 22:15:04 GMT, Jim Laskey <jlaskey at openjdk.org> wrote:

>> The new repeat methods were not clearing the toStringCache.
>
> Jim Laskey has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Clear sooner

LGTM.

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Marked as reviewed by mkarg at github.com (no known OpenJDK username).

PR Review: https://git.openjdk.org/jdk/pull/17172#pullrequestreview-1791741679