RFR: 8263721: Unify oop casting [v2]

[Stefan Karlsson]

On Tue, 23 Mar 2021 19:10:00 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> Stefan Karlsson has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains five commits:
>> 
>>  - Remove casts in merged changes
>>  - Merge remote-tracking branch 'origin/master' into 8263721_unify_oop_casting
>>  - Convert tab to spaces
>>  - Merge remote-tracking branch 'origin/master' into 8263721_unify_oop_casting
>>  - Stricter oop casts
>
> Looks like a safe to me. I didn't realize there were still so many files with oop casts.  I only scrolled by the GC ones though.

Thanks for reviewing!

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PR: https://git.openjdk.java.net/jdk/pull/3047