[lilliput-jdk17u:lilliput] RFR: 8310231: [Lilliput/JDK17] Disable compact headers by default

[Aleksey Shipilev]

Same as https://github.com/openjdk/lilliput/pull/99.

Note that I also reverted the change to `UseCompressedClassPointers`, for extra safety.

Additional testing:
 - [ ] Checked sample `@flagless` tests run with/without `UCOH`
 - [ ] Linux x86_64 tier1, out of box
 - [ ] Linux x86_64 tier1, `-XX:+UnlockExperimentalVMOptions -XX:+UseCompactObjectHeaders`
 - [ ] Linux x86_64 tier1, `-XX:+UnlockExperimentalVMOptions -XX:-UseCompactObjectHeaders`

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Commit messages:
 - Fix

Changes: https://git.openjdk.org/lilliput-jdk17u/pull/33/files
 Webrev: https://webrevs.openjdk.org/?repo=lilliput-jdk17u&pr=33&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8310231
  Stats: 8 lines in 2 files changed: 4 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/lilliput-jdk17u/pull/33.diff
  Fetch: git fetch https://git.openjdk.org/lilliput-jdk17u.git pull/33/head:pull/33

PR: https://git.openjdk.org/lilliput-jdk17u/pull/33