RFR: 8283408: Fix a C2 crash when filling arrays with unsafe [v2]

[Pengfei Li]

On Mon, 21 Mar 2022 08:17:30 GMT, Roland Westrelin <roland at openjdk.org> wrote:

>> Pengfei Li has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Add a few comments
>
> src/hotspot/share/opto/loopTransform.cpp line 4046:
> 
>> 4044:   Node* from = new AddPNode(base, base, index);
>> 4045:   _igvn.register_new_node_with_optimizer(from);
>> 4046:   if (offset != NULL) {
> 
> A comment here that this happens with unsafe would be useful.

Comments are added. Thanks!

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PR: https://git.openjdk.java.net/jdk/pull/7884