RFR: 8266571: Sequenced Collections [v10]

[Stuart Marks]

> PR for Sequenced Collections implementation.

Stuart Marks has updated the pull request incrementally with two additional commits since the last revision:

 - Wording tweaks to SequencedMap / NavigableMap.
 - Change "The implementation in this class" to "... interface."

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Changes:
  - all: https://git.openjdk.org/jdk/pull/7387/files
  - new: https://git.openjdk.org/jdk/pull/7387/files/b59f8dda..dc23a48f

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=7387&range=09
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=7387&range=08-09

  Stats: 42 lines in 8 files changed: 2 ins; 0 del; 40 mod
  Patch: https://git.openjdk.org/jdk/pull/7387.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/7387/head:pull/7387

PR: https://git.openjdk.org/jdk/pull/7387