RFR: 8368178: Add specialization of SequencedCollection methods to emptyList, singletonList and nCopies [v2]

[Tagir F. Valeev]

> Please review this small change. If you have more ideas which classes may miss specializations of SequencedCollection methods, I can add them to this PR as well.

Tagir F. Valeev has updated the pull request incrementally with two additional commits since the last revision:

 - Remove extra asterisk to prevent jtreg comment from being parsed as javadoc
 - JDK-8368178 Add specialization of SequencedCollection methods to emptyList, singletonList and nCopies

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Changes:
  - all: https://git.openjdk.org/jdk/pull/27406/files
  - new: https://git.openjdk.org/jdk/pull/27406/files/c45761cf..64e7fac2

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27406&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27406&range=00-01

  Stats: 3 lines in 3 files changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/27406.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27406/head:pull/27406

PR: https://git.openjdk.org/jdk/pull/27406