RFR: 8247781: Day periods support [v12]

[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 one additional commit since the last revision:

  Added a test case for user defined temporal field resolution with day period.

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/938/files
  - new: https://git.openjdk.java.net/jdk/pull/938/files/ccefe70c..a960804f

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=938&range=11
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=938&range=10-11

  Stats: 76 lines in 1 file changed: 76 ins; 0 del; 0 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