[jdk11u-dev] RFR: 8300727: java/awt/List/ListGarbageCollectionTest/AwtListGarbageCollectionTest.java failed with "List wasn't garbage collected"

[Amos Shi]

Backport of [JDK-8300727](https://bugs.openjdk.org/browse/JDK-8300727)
- Clean Backport
- Test Case compile issue

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Commit messages:
 - Backport f835aaafc7332d324ca9b08b2a34539fc1c573aa

Changes: https://git.openjdk.org/jdk11u-dev/pull/2364/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2364&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8300727
  Stats: 48 lines in 1 file changed: 18 ins; 8 del; 22 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2364.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2364/head:pull/2364

PR: https://git.openjdk.org/jdk11u-dev/pull/2364