RFR: 8286451: C2: assert(nb == 1) failed: only when the head is not shared [v2]

[Roland Westrelin]

On Tue, 7 Jun 2022 14:51:50 GMT, Christian Hagedorn <chagedorn at openjdk.org> wrote:

>> Roland Westrelin 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 three additional commits since the last revision:
>> 
>>  - review
>>  - Merge branch 'master' into JDK-8286451
>>  - fix & test
>
> That looks good, thanks for doing the updates!

@chhagedorn @TobiHartmann thanks for the reviews

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PR: https://git.openjdk.java.net/jdk/pull/8947