RFR: 8370503: Use String.newStringWithLatin1Bytes to simplify Integer/Long toString method [v2]

[Roger Riggs]

On Thu, 23 Oct 2025 15:34:23 GMT, Shaojin Wen <swen at openjdk.org> wrote:

>> With the introduction of String.newStringWithLatin1Bytes, we can use it to simplify the toString methods of Integer and Long. By replacing the implementation that supports COMPACT_STRING = false with newStringWithLatin1Bytes, we gain the following benefits:
>> 1. Simplified implementation
>> 2. Strings with codeSize < 35 in Integer.toString(int) and Long.toString(long) can be inlined in C1, improving performance in early calls.
>
> Shaojin Wen has updated the pull request incrementally with one additional commit since the last revision:
> 
>   clean up, from @rgiulietti

This cleanup looks good.

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Marked as reviewed by rriggs (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/27929#pullrequestreview-3371089369