[jdk11u-dev] RFR: 8252114: Windows-AArch64: Enable and test ZGC and ShenandoahGC [v2]

[Reka Kovacs]

> 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.

Reka Kovacs has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:

  Backport 96f722cf63ae0e115612d816aa339d38074d3ade

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Changes:
  - all: https://git.openjdk.java.net/jdk11u-dev/pull/304/files
  - new: https://git.openjdk.java.net/jdk11u-dev/pull/304/files/e70c0d80..2836aff9

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=304&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=304&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 1 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/304.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/304/head:pull/304

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