RFR: 8344565: SM cleanup in jdk/internal and java/lang package private classes [v2]

[Roger Riggs]

> SM removal for internal implementation classes: 
>     java.lang.CharacterName
>     java.lang.ref.Finalizer
>     jdk.internal.icu.impl.ICUBinary
>     jdk.internal.misc.ExtendedMapMode

Roger Riggs has updated the pull request incrementally with one additional commit since the last revision:

  Reviewer suggested updates:
  - remove obsolete imports
  - remove unnecessary SuppressWarnings("removal")
  - Use CharacterName.class as the base for getResourceStream

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/22370/files
  - new: https://git.openjdk.org/jdk/pull/22370/files/6a004ab9..e06e5681

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22370&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22370&range=00-01

  Stats: 5 lines in 3 files changed: 1 ins; 3 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/22370.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22370/head:pull/22370

PR: https://git.openjdk.org/jdk/pull/22370