RFR: 8294397: Replace StringBuffer with StringBuilder within java.text

[Naoto Sato]

On Wed, 28 Sep 2022 22:54:33 GMT, Justin Lu <duke at openjdk.org> wrote:

> Problem: Unnecessary instances of StringBuffer within java.text (internal only)
> 
> Fix: StringBuffer Replaced with StringBuilder, and adjusted variable/method names

AFAICT, the reason is described in the test class description, i.e., tweak to be in `java.text` package so that it can test the internal `hashCode` method.

btw I find a typo there:

* Bug #4170614 complained that we had two iternal classes that

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PR: https://git.openjdk.org/jdk/pull/10475