RFR: 8309129: AArch64: guarantee(T != T2S) failed: "incorrect arrangement" after JDK-8307795 [v5]

[Chang Peng]

> This patch fixes the issue introduced by JDK-8307795. Since addv[1] cannot support "T2S" SIMD arrangement, we should use addp[2] in this case.
> 
> TEST passed on AArch64:
> hotspot:compiler/vectorapi, jdk:jdk/incubator/vector, tier1-3
> 
> [1]: https://developer.arm.com/documentation/ddi0596/2020-12/SIMD-FP-Instructions/ADDV--Add-across-Vector-
> [2]: https://developer.arm.com/documentation/ddi0596/2020-12/SIMD-FP-Instructions/ADDP--vector---Add-Pairwise--vector--

Chang Peng has updated the pull request incrementally with one additional commit since the last revision:

  Update test case

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/14245/files
  - new: https://git.openjdk.org/jdk/pull/14245/files/a5342348..48aa7298

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14245&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14245&range=03-04

  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/14245.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14245/head:pull/14245

PR: https://git.openjdk.org/jdk/pull/14245