RFR: 8273373: Zero: Cannot invoke JVM in primordial threads on Zero

[Aleksey Shipilev]

On Mon, 6 Sep 2021 09:45:12 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> See the bug for more discussion.
> 
> Additional testing:
>  - [x] Linux Zero x86_64 passes most gtests now (there are unrelated failures)
>  - [x] Linux Zero x86_32 passes most gtests now (there are unrelated failures)

I looked around Debian's support for IA64, and I think we don't want to drop the support for it just yet. Zero VM is one of those last stands for weird arches portability :) Instead of adding the `IA64` block to a shared code, I shall try to make a more conservative fix to Zero-specific code then...

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PR: https://git.openjdk.java.net/jdk/pull/5376