RFR: 8331935: Add support for primitive array C1 clone intrinsic in PPC [v2]

[Varada M]

> https://bugs.openjdk.org/browse/JDK-8302850 port for PPC64
> 
> JMH Benchmark Results
> 
> 
> Before :
> 
> Benchmark                 (size)  Mode  Cnt    Score   Error  Units
> ArrayClone.byteArraycopy       0  avgt   15  114.107 ? 1.337  ns/op
> ArrayClone.byteArraycopy      10  avgt   15  130.492 ? 0.991  ns/op
> ArrayClone.byteArraycopy     100  avgt   15  139.103 ? 1.913  ns/op
> ArrayClone.byteArraycopy    1000  avgt   15  321.688 ? 6.033  ns/op
> ArrayClone.byteClone           0  avgt   15  227.602 ? 3.393  ns/op
> ArrayClone.byteClone          10  avgt   15  237.624 ? 2.996  ns/op
> ArrayClone.byteClone         100  avgt   15  239.219 ? 2.835  ns/op
> 
> ArrayClone.byteClone        1000  avgt   15  355.571 ? 2.946  ns/op
> ArrayClone.intArraycopy        0  avgt   15  113.275 ? 1.099  ns/op
> ArrayClone.intArraycopy       10  avgt   15  129.763 ? 1.458  ns/op
> ArrayClone.intArraycopy      100  avgt   15  213.327 ? 2.524  ns/op
> ArrayClone.intArraycopy     1000  avgt   15  449.650 ? 7.338  ns/op
> ArrayClone.intClone            0  avgt   15  225.682 ? 3.048  ns/op
> ArrayClone.intClone           10  avgt   15  234.532 ? 2.817  ns/op
> ArrayClone.intClone          100  avgt   15  295.934 ? 4.925  ns/op
> ArrayClone.intClone         1000  avgt   15  573.368 ? 5.739  ns/op
> Finished running test 'micro:java.lang.ArrayClone'
> Test report is stored in build/aix-ppc64-server-release/test-results/micro_java_lang_ArrayClone
> 
> ==============================
> Test summary
> ==============================
>    TEST                                              TOTAL  PASS  FAIL ERROR   
>    micro:java.lang.ArrayClone                            1     1     0     0   
> ==============================
> TEST SUCCESS
> 
> Finished building target 'test' in configuration 'aix-ppc64-server-release'
> 
> 
> 
> 
> After:
> 
> Benchmark                 (size)  Mode  Cnt    Score    Error  Units
> ArrayClone.byteArraycopy       0  avgt   15  113.894 ?  0.993  ns/op
> ArrayClone.byteArraycopy      10  avgt   15  131.455 ?  0.956  ns/op
> ArrayClone.byteArraycopy     100  avgt   15  139.145 ?  3.002  ns/op
> ArrayClone.byteArraycopy    1000  avgt   15  315.957 ? 14.591  ns/op
> ArrayClone.byteClone           0  avgt   15   43.753 ?  3.669  ns/op
> ArrayClone.byteClone          10  avgt   15   52.329 ?  1.041  ns/op
> ArrayClone.byteClone         100  avgt   15  127.711 ?  3.938  ns/op
> 
> ArrayClone.byteClone        1000  avgt   15  225.937 ?  1.987  ns/op
> ArrayClone.intArraycopy        0  avgt   15  113.788 ?  0.770  ns/op
> ArrayClone.intArraycopy       10  avgt   1...

Varada M has updated the pull request incrementally with one additional commit since the last revision:

  Add support for primitive array C1 clone intrinsic

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/19250/files
  - new: https://git.openjdk.org/jdk/pull/19250/files/f484bbee..0aa5b21c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=19250&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=19250&range=00-01

  Stats: 19 lines in 2 files changed: 6 ins; 8 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/19250.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19250/head:pull/19250

PR: https://git.openjdk.org/jdk/pull/19250