RFR: 8329273: C2 SuperWord: Some basic MemorySegment IR tests

[Vladimir Kozlov]

On Thu, 28 Mar 2024 16:34:38 GMT, Emanuel Peter <epeter at openjdk.org> wrote:

> I could not find any IR vectorization tests for `MemorySegment` yet.
> 
> I make sure to exercise different backing types:
> - arrays
> - buffers
> - native memory
> 
> I filed a follow-up RFE, to eventually make all cases where I have "FAILS" vectorize:
> 
> [JDK-8331659](https://bugs.openjdk.org/browse/JDK-8331659): C2 SuperWord: investicate failed vectorization in compiler/loopopts/superword/TestMemorySegment.java

Looks good.

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Marked as reviewed by kvn (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/18535#pullrequestreview-2041284796