[master] RFR: OMWorld: Cleanups [v2]

[Axel Boldt-Christmas]

> This contains a handful of miscellaneous cleanups. Removing dead code, fixes/cleanups todos, cleanup logging and removing all special handling of `x86_32` not having a thread register / lacking registers.

Axel Boldt-Christmas has updated the pull request incrementally with one additional commit since the last revision:

  LockStackInflateContendedLocks only used for current thread

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Changes:
  - all: https://git.openjdk.org/lilliput/pull/178/files
  - new: https://git.openjdk.org/lilliput/pull/178/files/9d01cafd..944d015a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=lilliput&pr=178&range=01
 - incr: https://webrevs.openjdk.org/?repo=lilliput&pr=178&range=00-01

  Stats: 6 lines in 1 file changed: 1 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/lilliput/pull/178.diff
  Fetch: git fetch https://git.openjdk.org/lilliput.git pull/178/head:pull/178

PR: https://git.openjdk.org/lilliput/pull/178