RFR: 8286660: codestrings gtest fails on AArch64: "udf" in padding

[Stuart Monteith]

On Fri, 13 May 2022 09:10:09 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> On hsdis-enabled AArch64 machine this test fails even with [JDK-8274039](https://bugs.openjdk.java.net/browse/JDK-8274039):
> 
> 
> $ CONF=linux-aarch64-server-fastdebug make run-test TEST=jtreg:gtest/GTestWrapper.java
> 
> [----------] 1 test from codestrings
> [ RUN      ] codestrings.validate_vm

That's interesting. While the permanently undefined instruction, and immediate, is defined, I suppose it could be treated as an undefined instruction, and ignored. We don't actually emit or even define this instruction in the aarch64 assembly, so it can be safely ignored.
LGTM.

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PR: https://git.openjdk.java.net/jdk/pull/8695