RFR: 8315585: Optimization for decimal to string

[Chen Liang]

On Sat, 25 Jan 2025 07:25:40 GMT, Shaojin Wen <swen at openjdk.org> wrote:

> Continue to complete PR #16006 and PR #21593 to improve BigDecimal::toString and BigDecimal::toPlainString performance and reduce duplicate code

A great cleanup that consolidates scale2, unscaledAbsString, and unscaledString.

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PR Comment: https://git.openjdk.org/jdk/pull/23310#issuecomment-2614544055