[jdk21u-dev] RFR: 8353013: java.net.URI.create(String) may have low performance to scan the host/domain name from URI string when the hostname starts with number

[Rui Li]

Backport of https://github.com/openjdk/jdk/commit/84458ec18ce33295636f7b26b8e3ff25ecb349f2. [JDK-8353013](https://bugs.openjdk.org/browse/JDK-8353013).

Clean backport except for copyright header.

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Commit messages:
 - Backport 84458ec18ce33295636f7b26b8e3ff25ecb349f2

Changes: https://git.openjdk.org/jdk21u-dev/pull/1776/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1776&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8353013
  Stats: 112 lines in 3 files changed: 109 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1776.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1776/head:pull/1776

PR: https://git.openjdk.org/jdk21u-dev/pull/1776