[jdk11u-dev] RFR: 8252114: Windows-AArch64: Enable and test ZGC and ShenandoahGC

[Aleksey Shipilev]

On Tue, 31 Aug 2021 13:31:23 GMT, Reka Kovacs <github.com+25946952+rnkovacs at openjdk.org> wrote:

> The original commit and the backport don't have a lot to do with each other quite honestly, but they both fit under the JBS issue. The original commit enabled ZGC for Windows/AArch64 (Shenandoah was already enabled on all AArch64 platforms), while this one enables Shenandoah.
> 
> This is part of the Windows/AArch64 port.

I have a question. [Upstream version checks](https://github.com/openjdk/jdk/blob/master/make/autoconf/jvm-features.m4#L309-L310) `OPENJDK_TARGET_CPU` directly. Why not to do the same here? The only reason off the top of my head is to avoid accidentally enabling macos-aarch64, but that port is not yet in 11u, and Shenandoah is supposed to work there anyway.

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PR: https://git.openjdk.java.net/jdk11u-dev/pull/304