This address a minor inefficiency in that the `ZoneRules` of any `ZoneOffset` (and some `ZoneRegion`s) allocate `lastRulesCache` unnecessarily.
------------- Commit messages: - Merge branch 'master' into lastRulesCache - Avoid allocating unused lastRulesCaches Changes: https://git.openjdk.java.net/jdk/pull/7990/files Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7990&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8283781 Stats: 16 lines in 1 file changed: 9 ins; 2 del; 5 mod Patch: https://git.openjdk.java.net/jdk/pull/7990.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/7990/head:pull/7990 PR: https://git.openjdk.java.net/jdk/pull/7990
