RFR: 8255305: Add Linux x86_32 tier1 to submit workflow [v2]

[Magnus Ihse Bursie]

On Tue, 27 Oct 2020 10:39:29 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> Following JDK-8254282, it seems useful to also run tier1 tests on 32-bit platform, because that finds problems with runtime tests and internal asserts. Those problems do not show up during the plain build. Again, while x86_32 might not be widely deployed by itself, but 32/64 bit cleanliness detects bugs that manifest on ARM32 early.
>> 
>> I did most of the work to fix all current regressions in x86_32 tier1, the only exception is JDK-8255331, which is supposed to be fixed by #833
>
> Aleksey Shipilev has updated the pull request incrementally with four additional commits since the last revision:
> 
>  - Rename "x32" -> "x86" in the test steps
>  - Merge branch 'JDK-8255412-add-x32-default' into JDK-8255305-32bit-tier1
>  - Rename x32 -> x86.
>  - 8255412: Add "Linux x32" to platform selection default in custom submit workflow

Please incorporate the additional fixes in https://github.com/openjdk/jdk/pull/869 into this PR. That also means that the new code here that mentions "linux-x32" needs to be renamed. After that, you can close #869.

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Changes requested by ihse (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/830