RFR: 8266746: C1: Replace UnsafeGetRaw with UnsafeGetObject when setting up OSR entry block [v2]

[Yi Yang]

On Wed, 19 May 2021 08:57:57 GMT, Tobias Hartmann <thartmann at openjdk.org> wrote:

>> Yi Yang has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   unaliged_move for ppc/s390
>
> Looks good to me but this should be tested on all platforms.

@TobiHartmann @dean-long It seems that there is no easy way to test this PR on all architectures. Can I merge this PR in this case? If not, do you have a general solution for changes that should be tested on all architectures while the author can not cover all architectures for PR that they made? Thanks in advance!

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PR: https://git.openjdk.java.net/jdk/pull/3917