RFR: 8284563: AArch64: bitperm feature detection for SVE2 on Linux [v2]

[Eric Liu]

On Tue, 19 Apr 2022 07:30:11 GMT, Andrew Haley <aph at openjdk.org> wrote:

>> @theRealAph 
>> 
>> TBH I don't know the history about this code. Considering that may impact the performance, I don't have too much confidence to dispose of  it in this patch.
>> 
>> Do you think it's fine to trace it in a separate JBS?
>
> Absolutely, yes, getting rid of `STXR_PREFETCH` should be separate from this patch.
> 
> We need, as a group, to keep on top of accreting complexity. That's hard when the people changing code don't know the history of that code.

I created a separate JBS for it. https://bugs.openjdk.java.net/browse/JDK-8284990

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PR: https://git.openjdk.java.net/jdk/pull/8258