RFR: 8261142: AArch64: Incorrect instruction encoding when right-shifting vectors with shift amount equals to the element width [v9]

[Dong Bo]

On Tue, 9 Feb 2021 07:50:45 GMT, Ningsheng Jian <njian at openjdk.org> wrote:

>> Dong Bo has updated the pull request incrementally with two additional commits since the last revision:
>> 
>>  - whitespace
>>  - Rebase tests so that sshr/ushr/sshl/ssra/usra are accessed in one jtreg case, assembly print verified.
>
> Thanks for the fix.

Hi, @theRealAph 

I've rebased the tests so that sshr/ushr/sshl/ssra/usra are accessed in one jtreg `test/hotspot/jtreg/compiler/vectorapi/TestVectorShiftImm.java`.
Local tests by manually injected error shows all instructions are covered by the jtreg case. Suggestions?

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PR: https://git.openjdk.java.net/jdk/pull/2472