[jdk11u-dev] RFR: 8218471: generate-unsafe-access-tests.sh does not correctly invoke build.tools.spp.Spp [v2]

[Xiaolin Zheng]

> The `generate-unsafe-access-tests.sh` script doesn't work on JDK11 and the fix is in JDK13. I am working around the changes belonging to [JDK-8207146](https://bugs.openjdk.org/browse/JDK-8207146), please see discussions in [JDK-8292443](https://bugs.openjdk.org/browse/JDK-8292443).
> 
> Thanks,
> Xiaolin

Xiaolin Zheng 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 Spp
 - 8218471: generate-unsafe-access-tests.sh does not correctly invoke build.tools.spp.Spp

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

Changes:
  - all: https://git.openjdk.org/jdk11u-dev/pull/1852/files
  - new: https://git.openjdk.org/jdk11u-dev/pull/1852/files/de3bac64..2df80d76

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1852&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1852&range=00-01

  Stats: 4419 lines in 143 files changed: 3407 ins; 642 del; 370 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1852.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/1852/head:pull/1852

PR: https://git.openjdk.org/jdk11u-dev/pull/1852