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

[Shaojin Wen]

> 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

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Changes:
  - all: https://git.openjdk.org/jdk/pull/27929/files
  - new: https://git.openjdk.org/jdk/pull/27929/files/cf7b33a8..9818de0b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27929&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27929&range=00-01

  Stats: 41 lines in 2 files changed: 0 ins; 41 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/27929.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27929/head:pull/27929

PR: https://git.openjdk.org/jdk/pull/27929