RFR: 8315029: [BACKOUT] Generational ZGC: Tests crash with assert(index == 0 || is_power_of_2(index))

Mon Aug 28 09:10:38 UTC 2023

This changeset backs out the changes introduced by [JDK-8312749](https://bugs.openjdk.org/browse/JDK-8312749) and re-enables the problem-listed `test/jdk/java/lang/template/StringTemplateTest.java`. The backed-out issue will be re-addressed in [JDK-8315082](https://bugs.openjdk.org/browse/JDK-8315082).

#### Testing

- tier1-3 (windows-x64, linux-x64, linux-aarch64, macosx-x64, and macosx-aarch64)
- `test/jdk/java/lang/template/StringTemplateTest.java`

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Commit messages:
 - Revert "8315033: Problemlist java/lang/template/StringTemplateTest.java"
 - Revert "8312749: Generational ZGC: Tests crash with assert(index == 0 || is_power_of_2(index))"

Changes: https://git.openjdk.org/jdk/pull/15442/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15442&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8315029
  Stats: 116 lines in 5 files changed: 9 ins; 90 del; 17 mod
  Patch: https://git.openjdk.org/jdk/pull/15442.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15442/head:pull/15442

PR: https://git.openjdk.org/jdk/pull/15442