[master] RFR: Fix some tests to work with +UseCompressedClassPointers

[Roman Kennke]

Some tests assume -UseCompressedClassPointers, but we're forcing +UseCompressedClassPointers, so let's fix those tests.

Testing:
 - [x] tier1
 - [x] tier2
 - [x] jdk/jfr
 - [x] testlibrary_tests/ir_framework/tests

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Commit messages:
 - Fix some tests to work with +UseCompressedClassPointers

Changes: https://git.openjdk.java.net/lilliput/pull/19/files
 Webrev: https://webrevs.openjdk.java.net/?repo=lilliput&pr=19&range=00
  Stats: 4 lines in 3 files changed: 0 ins; 1 del; 3 mod
  Patch: https://git.openjdk.java.net/lilliput/pull/19.diff
  Fetch: git fetch https://git.openjdk.java.net/lilliput pull/19/head:pull/19

PR: https://git.openjdk.java.net/lilliput/pull/19