[jdk8u-dev] RFR: 8287663: Add a regression test for JDK-8287073 [v2]

[Severin Gehwolf]

> Simple low risk backport for a regression check of https://bugs.openjdk.org/browse/JDK-8287073 (forthcoming). The only changes were (other than context changes due to `optResult.equals(Optional.empty()` vs `optResult.isEmpty()` differences):
> 
> - Bug line in test. Fixed manually
> - `Files.writeString()` => `Files.write()` changes in test.
> 
> Testing:
>  - [x] New regression test fails without the product fix of JDK-8287073, passes with it.
>  - [x] Linux container tests on x86_64 and cg1

Severin Gehwolf 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 three additional commits since the last revision:

 - Fix bug line
 - Merge branch 'master' into jdk-8287663-backport
 - Backport 2d8c6490540e3ccea23b81129b2e4073915071e0

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

Changes:
  - all: https://git.openjdk.org/jdk8u-dev/pull/323/files
  - new: https://git.openjdk.org/jdk8u-dev/pull/323/files/63a56c99..6a4dca71

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=323&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=323&range=00-01

  Stats: 890336 lines in 233 files changed: 889234 ins; 849 del; 253 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/323.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev.git pull/323/head:pull/323

PR: https://git.openjdk.org/jdk8u-dev/pull/323