RFR: 8248191: [PPC64] Replace lxvd2x/stxvd2x with lxvx/stxvx for Power10

[Ziviani]

On Tue, 10 Nov 2020 22:13:53 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

> Did you run Vector API tests (test/jdk/jdk/incubator/vector) on Power 10?

just did it:
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Test summary
==============================
   TEST                                              TOTAL  PASS  FAIL ERROR   
   jtreg:test/jdk/jdk/incubator                         73    73     0     0   
==============================
TEST SUCCESS

> Doesn't this mean we use a different Byte order on Power 9 than on Power 10 on little endian?

hmm, good question. I'll investigate it. Looking at the ISA 3.1 (and comparing with 3.0) I don't the difference, but I'll check it.
_(side node: if you want me to make any test on a P10 just tell me)_

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PR: https://git.openjdk.java.net/jdk/pull/1086