RFR: 8327380: Add tests for Shenandoah barrier expansion optimization [v2]

[Aleksey Shipilev]

On Tue, 25 Jun 2024 17:12:35 GMT, Kangcheng Xu <kxu at openjdk.org> wrote:

>> The Ideal graph for Shenandoah barrier expansion is optimized so that unnecessary checks are eliminated; however, currently there is no test cases to determine these optimizations are in effect.
>> 
>> Adding unit tests with the IR test framework will support related code changes in the future.
>
> Kangcheng Xu 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 ten additional commits since the last revision:
> 
>  - Merge branch 'master' into test-shenandoah-barrier-expansion
>  - update asserted IR phase
>  - change assertion phase from MACRO_EXPANSION to AFTER_MACRO_EXPANSION_STEP
>  - add license header
>  - update test annotation
>  - Merge branch 'master' into test-shenandoah-barrier-expansion
>  - update vm flags
>  - update vm flags
>  - add TestShenandoahBarrierExpansion

OK, thanks. Please re-issue `/integrate`.

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

PR Comment: https://git.openjdk.org/jdk/pull/18814#issuecomment-2191070078