RFR: 8351651: Cleanup LockStack::is_owning_thread [v5]

[Coleen Phillimore]

> This is a minor mostly trivial change I found while reading through code looking for something else.
> Tested with tier1-4.

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

  Restore lightweight case and removed NOT_PRODUCT.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/23981/files
  - new: https://git.openjdk.org/jdk/pull/23981/files/f52d1fbd..e2d79f56

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23981&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23981&range=03-04

  Stats: 5 lines in 2 files changed: 4 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/23981.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23981/head:pull/23981

PR: https://git.openjdk.org/jdk/pull/23981