RFR: 8277517: Bump minimum boot jdk to JDK 18 [v2]

Wed Apr 6 16:41:25 UTC 2022

> With the JDK 18 GA out it's time to bump the minimum boot JDK version for mainline/JDK 19.
> 
> Testing: tier1-5, GHA builds

Mikael Vidstedt has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:

 - Merge branch 'master' into 8277517-bootjdk18
 - 8277517: Bump minimum boot jdk to JDK 18

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8102/files
  - new: https://git.openjdk.java.net/jdk/pull/8102/files/11f2d565..1672ca6a

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8102&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8102&range=00-01

  Stats: 8111 lines in 304 files changed: 6444 ins; 1379 del; 288 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8102.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8102/head:pull/8102

PR: https://git.openjdk.java.net/jdk/pull/8102