RFR: 8288723: Avoid redundant ConcurrentHashMap.get call in java.time [v2]

[Andrey Turbanov]

> Instead of separate ConcurrentHashMap.get call, we can use result of previous putIfAbsent call.

Andrey Turbanov has updated the pull request incrementally with one additional commit since the last revision:

  8288723: Avoid redundant ConcurrentHashMap.get call in java.time
  use computeIfAbsent where lambda could be short and static

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Changes:
  - all: https://git.openjdk.org/jdk/pull/9208/files
  - new: https://git.openjdk.org/jdk/pull/9208/files/73a2f6cb..aa67cdf6

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=9208&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=9208&range=00-01

  Stats: 18 lines in 2 files changed: 0 ins; 16 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/9208.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9208/head:pull/9208

PR: https://git.openjdk.org/jdk/pull/9208