RFR: 8256657: Add cross-compiled build for Windows+Arm64 to submit workflow

[Aleksey Shipilev]

On Mon, 23 Nov 2020 09:35:40 GMT, Bernhard Urban-Forster <burban at openjdk.org> wrote:

> This adds the cross-compiled build only, as no Windows+Arm64 machines are available on GitHub Action that we could use to run the tests.
> 
> Due to cross-compilation a build JDK is required. Initially I added EA builds to be downloaded from https://jdk.java.net/16/ and used for that, but then I saw how @shipiliv attempted it for the linux cross-compilation builds in https://github.com/openjdk/jdk/pull/1147.  That is using the JDK image produced by the x64 variant. This however add more stress to the "critical path", as now two more jobs depend on the x64 build first.
> 
> Let's see how it works out in the long-run. A Windows+AArch64 build takes 40-50min.

I think you need to wait for #1350, and then reconcile this patch with that refactoring.

.github/workflows/submit.yml line 1250:

> 1248:         flavor:
> 1249:           - build release
> 1250:           - build debug

Other foreign arches build only `debug`, thus optimizing the workflow time, drop `release` here?

.github/workflows/submit.yml line 1367:

> 1365:           git apply p.patch
> 1366:         working-directory: jdk
> 1367:         shell: bash

This should be in the mainline repo instead. Yes, the absence of this patch blocks this PR, but getting that patch into the mainline first is the right thing to do.

.github/workflows/submit.yml line 2021:

> 2019:       - linux_x64_test
> 2020:       - linux_x86_test
> 2021:       - windows_aarch64_build

This should move to other `_build` needs, for clarity.

-------------

Changes requested by shade (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/1379