RFR: 8221554: aarch64 cross-modifying code [v4]

[Alan Hayward]

On Mon, 19 Oct 2020 08:20:46 GMT, Robbin Ehn <rehn at openjdk.org> wrote:

>> Alan Hayward has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Remove inlasm_isb define
>>   
>>   Change-Id: I2d0ef8a78292dac875f3f65d2253981cdb7a497a
>
> Seems fine to me, mostly look at shared code part.

Patch merged to master - so that it's on top of pchilano's patch.
Already tested that both the patches work fine together (did a complete run of all our tests with VerifyCrossModifyFence set to true).
robehn has reviewed this patch, but I think I need a second review too (?)

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PR: https://git.openjdk.java.net/jdk/pull/428