RFR: 8304696: Duplicate class names in dynamicArchive tests can lead to test failure

Wed Apr 19 17:15:51 UTC 2023

To avoid duplicate class name `MyShutdown`, the fix is to change the `MyShutdown` class name for the LambdaProxyDuringShutdown.java test to `ShutdownHelper`.

Tested manually by running the LInkClassTest.java and LambdaProxyDuringShutdown.java tests serially on linux-x64.
Also ran tiers 1 and 3 testing.

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Commit messages:
 - 8304696: Duplicate class names in dynamicArchive tests can lead to test failure

Changes: https://git.openjdk.org/jdk/pull/13542/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13542&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8304696
  Stats: 4 lines in 2 files changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/13542.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13542/head:pull/13542

PR: https://git.openjdk.org/jdk/pull/13542