<i18n dev> RFR: 8247781: Day periods support [v4]

[Naoto Sato]

> Hi,
> 
> Please review the changes for the subject issue. This is to enhance the java.time package to support day periods, such as "in the morning", defined in CLDR. It will add a new pattern character 'B' and its supporting builder method. The motivation and its spec are in this CSR:
> 
> https://bugs.openjdk.java.net/browse/JDK-8254629
> 
> Naoto

Naoto Sato has updated the pull request incrementally with three additional commits since the last revision:

 - Addressing https://github.com/openjdk/jdk/pull/938#discussion_r516147298
 - Addressing https://github.com/openjdk/jdk/pull/938#discussion_r516123190
 - Addressing https://github.com/openjdk/jdk/pull/938#discussion_r516138455

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/938/files
  - new: https://git.openjdk.java.net/jdk/pull/938/files/29c47afc..297acc94

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=938&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=938&range=02-03

  Stats: 66 lines in 2 files changed: 53 ins; 3 del; 10 mod
  Patch: https://git.openjdk.java.net/jdk/pull/938.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/938/head:pull/938

PR: https://git.openjdk.java.net/jdk/pull/938