RFR: 8256479: [PPC64] C2 crashes when UseVectorByteReverseInstructionsPPC64 used without SuperwordUseVSX

[Martin Doerr]

On Tue, 17 Nov 2020 19:45:03 GMT, Paul Sandoz <psandoz at openjdk.org> wrote:

>> C2 crashes on Power9 when using UseVectorByteReverseInstructionsPPC64 without SuperwordUseVSX. bytes_reverse_long_vecNode uses a Vector Register. See bug for more details.
>> 
>> The VectorConversion tests can detect the issue.
>
> Test update looks good.

Thanks for the reviews!

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PR: https://git.openjdk.java.net/jdk/pull/1262