RFR: Read ObjectAlignmentInBytes regardless of UseCompressedOops value

[Anton Rybochkin]

This fixes alignment detection on Generational ZGC

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Commit messages:
 - Read ObjectAlignmentInBytes regardless of UseCompressedOops value.

Changes: https://git.openjdk.org/jol/pull/63/files
  Webrev: https://webrevs.openjdk.org/?repo=jol&pr=63&range=00
  Stats: 7 lines in 1 file changed: 0 ins; 3 del; 4 mod
  Patch: https://git.openjdk.org/jol/pull/63.diff
  Fetch: git fetch https://git.openjdk.org/jol.git pull/63/head:pull/63

PR: https://git.openjdk.org/jol/pull/63