RFR: JDK-8297299 SequenceInputStream should not use Vector [v5]

[Markus KARG]

> There is no need to use a temporary Vector within the constructor of SynchronizedInputStream, as more efficient (non-synchronized) alternative code (like List.of) will do the same in possibly less time. While the optimization is not dramatic, it still makes sense to replace Vector unless synchronization is really needed.

Markus KARG has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:

  Jens' Proposal

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Changes:
  - all: https://git.openjdk.org/jdk/pull/11249/files
  - new: https://git.openjdk.org/jdk/pull/11249/files/9b3fe93d..2e957354

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=11249&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=11249&range=03-04

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/11249.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11249/head:pull/11249

PR: https://git.openjdk.org/jdk/pull/11249