RFR: 8348870: Eliminate array bound checks in DecimalDigits

[Chen Liang]

On Tue, 28 Jan 2025 14:49:45 GMT, Shaojin Wen <swen at openjdk.org> wrote:

> Expand DIGITS length to 128 and eliminate array bounds checking by using & 0x7F when accessing DIGITS

Simple optimization, unfortunately this is a nice feature of the JVM not properly exposed in the language or libraries.

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Marked as reviewed by liach (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/23335#pullrequestreview-2578731387