RFR: 8272723: Don't use Access API to access primitive fields [v3]

[Roman Kennke]

On Fri, 20 Aug 2021 08:51:54 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

>> For earlier incarnations of Shenandoah, we needed to put barriers before accessing primitive fields. This is no longer necessary nor implemented/used by any GC, and we should simplify the code to do plain access instead.
>> 
>> (We may want to remove remaining primitive access machinery in the Access API soon)
>> 
>> Testing:
>>  - [x] build x86_32 and x86_64
>>  - [x] tier1
>>  - [x] tier2
>>  - [x] hotspot_gc
>
> Roman Kennke has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains seven additional commits since the last revision:
> 
>  - Merge branch 'master' into JDK-8272723
>  - Remove redundant asserts
>  - Revert to use RawAccess<MO_SEQ_CST> for volatile accesses
>  - Fix alignment
>  - Consolidate (obj)field_addr() variants
>  - Remove remaining primitive Access API uses
>  - 8272723: Don't use Access API to access primitive fields

This PR has been lingering for a while. Can I get another review, please? Maybe @fisk or @stefank?
Thanks, Roman

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PR: https://git.openjdk.java.net/jdk/pull/5187