[lworld] RFR: 8373575: [lworld] Fix and problem list failing JDK, langtools and HotSpot tier 1 tests under --enable-preview [v5]

[Paul Hübner]

On Mon, 15 Dec 2025 21:07:07 GMT, Daniel D. Daugherty <dcubed at openjdk.org> wrote:

>> Paul Hübner has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains five additional commits since the last revision:
>> 
>>  - Merge branch 'lworld' into JDK-8373575
>>  - Move some tests to Xcomp list.
>>  - Add failing test to problemlist.
>>  - Add one of the AOT tests.
>>  - Problemlist and fix.
>
> test/hotspot/jtreg/compiler/escapeAnalysis/Test8329757.java line 46:
> 
>> 44:     void q() {
>> 45:         int e;
>> 46:         synchronized (new Object()) {
> 
> What motivated this change?

We cannot synchronize on value classes (primitive boxes are migrated to value classes with preview mode enabled) and we throw an `IdentityException` if we attempt to do so. I've talked with the author of the test and compiler folks and it doesn't change the semantics if we change the mutex.

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PR Review Comment: https://git.openjdk.org/valhalla/pull/1793#discussion_r2622436048