RFR: 7904027: JOL: Add test cases for ZGC and object alignments [v2]

[Anton Rybochkin]

> This test reveals incorrect object alignment detection when using generational ZGC which results in high object size reported (512k on aarch64 and 64k otherwise)

Anton Rybochkin has updated the pull request incrementally with one additional commit since the last revision:

  Fixed default alignment on 32-bit platforms

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Changes:
  - all: https://git.openjdk.org/jol/pull/64/files
  - new: https://git.openjdk.org/jol/pull/64/files/43f8a0b6..08b43570

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jol&pr=64&range=01
 - incr: https://webrevs.openjdk.org/?repo=jol&pr=64&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jol/pull/64.diff
  Fetch: git fetch https://git.openjdk.org/jol.git pull/64/head:pull/64

PR: https://git.openjdk.org/jol/pull/64