RFR: 8275052: AArch64: Fix flag handling for MacOS.

[Nick Gasson]

On Mon, 11 Oct 2021 13:06:14 GMT, Andrew Haley <aph at openjdk.org> wrote:

> This is more of the fallout from JDK-8273297.
> We've noticed that blocks of less than 8kbytes are very slowly encrypted with AES/GCM . This is because of incorrect flag handline in vm_version_bsd_aarch64.cpp. 
> 
> Before this patch:
> 
> 
> Benchmark            (dataSize)  (keyLength)  (provider)  Mode  Cnt      Score      Error  Units
> AESGCMBench.decrypt        8191          256              avgt    6  95821.232 ± 2447.246  ns/op
> AESGCMBench.decrypt        8192          256              avgt    6   3653.619 ±   83.432  ns/op
> 
> 
> After:
> 
> 
> Benchmark            (dataSize)  (keyLength)  (provider)  Mode  Cnt     Score    Error  Units
> AESGCMBench.decrypt        8191          256              avgt    6  3371.735 ± 70.204  ns/op
> AESGCMBench.decrypt        8192          256              avgt    6  3119.928 ± 80.375  ns/op

Marked as reviewed by ngasson (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/5894