[jdk17u-dev] RFR: 8322968: [17u] Amend Atomics gtest with 1-byte tests

[Aleksey Shipilev]

[JDK-8316645](https://bugs.openjdk.org/browse/JDK-8316645) was backported to 17u without the relevant test additions, because the test file was missing. But now, after the series of atomic support backports, we have the test file, so we can now complete the backport with the test hunks.

Compare 17u-dev version:
 https://github.com/openjdk/jdk17u-dev/commit/db83123c5cc054cee5663201ead92410e6487d81

...and the mainline:
 https://github.com/openjdk/jdk/commit/fb055e7e5300958b2a6a290aa6783e8ede929d9a

This change adds the missing hunk from mainline change. It includes [JDK-8317335](https://bugs.openjdk.org/browse/JDK-8317335) fix as well.

cc: @zifeihan, @RealFYang

Additional testing:
 - [x] macos-aarch64-server-fastdebug, `Atomics` test still passes

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

Commit messages:
 - Backport JDK-8317335
 - Missing piece of JDK-8316645

Changes: https://git.openjdk.org/jdk17u-dev/pull/2095/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=2095&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8322968
  Stats: 45 lines in 1 file changed: 45 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/2095.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/2095/head:pull/2095

PR: https://git.openjdk.org/jdk17u-dev/pull/2095