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

[Raffaello Giulietti]

On Wed, 22 Oct 2025 06:28:34 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.

Nice cleanup.

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PR Comment: https://git.openjdk.org/jdk/pull/27929#issuecomment-3437301491