[master] RFR: Enforce +UseCompressedClassPointers

[Roman Kennke]

This change force-enables +UseCompressedClassPointers. This is required for the next step where we want to store the compressed class pointers into object headers. The change also removes test configurations that explicitely disable CCP.
In the long run, we would remove the flag altogether, but not now.

Testing:
 - [x] tier1
 - [ ] tier2

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Commit messages:
 - Enforce +UseCompressedClassPointers

Changes: https://git.openjdk.java.net/lilliput/pull/5/files
 Webrev: https://webrevs.openjdk.java.net/?repo=lilliput&pr=5&range=00
  Stats: 264 lines in 15 files changed: 5 ins; 221 del; 38 mod
  Patch: https://git.openjdk.java.net/lilliput/pull/5.diff
  Fetch: git fetch https://git.openjdk.java.net/lilliput pull/5/head:pull/5

PR: https://git.openjdk.java.net/lilliput/pull/5