RFR: 8271869: AArch64: build errors with GCC11 in frame::saved_oop_result

[Nick Gasson]

On Thu, 5 Aug 2021 14:14:38 GMT, Alan Hayward <github.com+4146708+a74nh at openjdk.org> wrote:

> GCC11 warns that r0 is null. It does not complain if r1 is used instead.
> 
> AIUI, it is undefined behaviour in C++ to call member functions without
> a valid this pointer. So, technically GCC is correct to warn.

This looks ok to me as it's the same workaround as JDK-8270083 but @kimbarrett probably ought check it too.

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Marked as reviewed by ngasson (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/5020