RFR: 8350616: Skip ValidateHazardPtrsClosure in non-debug builds [v2]

[David Holmes]

> Simple cleanup to skip debug code in a non-debug build. This removes some overhead when working with very large numbers of threads. Basic perf testing starting a new thread when 20000 already exist:
> 
> Before: 532377 ns
> After:  361178 ns
> 
> which is 32% improvement.
> 
> Testing:
>   - tiers 1-3 sanity
> 
> Thanks

David Holmes has updated the pull request incrementally with one additional commit since the last revision:

  Change DEBUG to ASSERT

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/23762/files
  - new: https://git.openjdk.org/jdk/pull/23762/files/2411daa6..e38b45ed

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23762&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23762&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/23762.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23762/head:pull/23762

PR: https://git.openjdk.org/jdk/pull/23762