RFR: 7904026: JOL: Handle (generational) ZGC when dealing with raw addresses [v2]

[Anton Rybochkin]

> Because of color bits in lower positions, object alignment size heuristics does not work with generational ZGC. This PR implements address uncolorizing so alignment size and hence object size is calculated correctly

Anton Rybochkin has updated the pull request incrementally with two additional commits since the last revision:

 - Update jol-core/src/main/java/org/openjdk/jol/vm/HotspotUnsafe.java
   
   Co-authored-by: Aleksey Shipilëv <shipilev at amazon.de>
 - Update jol-core/src/main/java/org/openjdk/jol/vm/ZGCAddress.java
   
   Co-authored-by: Aleksey Shipilëv <shipilev at amazon.de>

-------------

Changes:
  - all: https://git.openjdk.org/jol/pull/65/files
  - new: https://git.openjdk.org/jol/pull/65/files/9692cc91..b643960d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jol&pr=65&range=01
 - incr: https://webrevs.openjdk.org/?repo=jol&pr=65&range=00-01

  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jol/pull/65.diff
  Fetch: git fetch https://git.openjdk.org/jol.git pull/65/head:pull/65

PR: https://git.openjdk.org/jol/pull/65