RFR(S): 8228649: [PPC64] SA reads wrong slots from interpreter frames

[Doerr, Martin]

Hi Götz,

thanks for the review.

> You might want to describe in the bug how you have fixed this.
Done.

> Did you check that all the StackOverflow tests still work in the
> debug build?
Yes, tests have run several times and no new issues have shown up. 

> In the ProblemList, please remove the bugids of 8211767.
Done.

Best regards,
Martin