[lworld] RFR: 8310655: [lworld] ShouldNotReachHere() error in ObjectSynchronizer::FastHashCode [v2]

[Coleen Phillimore]

> This change uses the klass as the hashcode for inline objects.  It might have some negative performance impact if there are a lot of objects of the same type in the heap walk but it's better than crashing.
> Tested with vmTestbase/nsk/jvmti tests locally.

Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:

  Improve comment.

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

Changes:
  - all: https://git.openjdk.org/valhalla/pull/1156/files
  - new: https://git.openjdk.org/valhalla/pull/1156/files/163eff30..86f00c4b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=valhalla&pr=1156&range=01
 - incr: https://webrevs.openjdk.org/?repo=valhalla&pr=1156&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/valhalla/pull/1156.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1156/head:pull/1156

PR: https://git.openjdk.org/valhalla/pull/1156