RFR: 8347405: MergeStores with reverse bytes order value [v4]

[Richard Reingruber]

On Fri, 24 Jan 2025 02:03:13 GMT, kuaiwei <duke at openjdk.org> wrote:

>> @kuaiwei Feel free to ping me again here whenever this is ready for a re-review :)
>
> @eme64 , I made new change to merge more stores. It could merge pattern like
> ```c++
> a[0] = vL <<  8;
> a[1] = vL << 16;
> a[2] = vL << 24;
> a[3] = vL << 32;
> 
> It passed tier1 tests in x86 and aarch64 platform. May I ask you to review it again? Thanks.

@kuaiwei this is a small test-fix for big-endian https://github.com/reinrich/jdk/commit/188a97a0deeb6bb912162846d02901079968c39f
I havn't seen any test failures in broader testing. Will repeat for latest change.

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PR Comment: https://git.openjdk.org/jdk/pull/23030#issuecomment-2611975579