RFR: 8372641: [s390x] Test failure TestMergeStores.java [v3]

[Amit Kumar]

On Thu, 27 Nov 2025 08:59:09 GMT, Harshit470250 <duke at openjdk.org> wrote:

>> [JDK-8347405](https://bugs.openjdk.org/browse/JDK-8347405) introduced a mergeStores optimisation which requires ReverseBytesS opcode and as it was not implemented for s390 the test case is failing.
>> I also implemented ReverseBytesUS.
>
> Harshit470250 has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Added whitespace

LGTM, I ran tier1 test and it fixed the testcase without new regression. 

@RealLucy you want to take a look at this one ?

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Marked as reviewed by amitkumar (Committer).

PR Review: https://git.openjdk.org/jdk/pull/28523#pullrequestreview-3528539709