Integrated: 8265702: ZGC on macOS/aarch64

[Per Liden]

On Wed, 21 Apr 2021 21:10:02 GMT, Per Liden <pliden at openjdk.org> wrote:

> This patch enables ZGC on macOS/aarch64. It does three things:
> 1) Enables building of ZGC on this platform.
> 2) Adds `os::processor_id()`, which for now always returns 0.
> 3) Fixes a WX issue in `OptoRuntime::handle_exception_C()`, where the stackwater mark might unnecessarily process a frame when the thread is in WXExec mode. In this case, the we're not touching any oops, so we don't need to process any frames.
> 
> Testing: Passes the same tests as macOS/x86_64 (with the exception of pre-existing issues unrelated to ZGC).

This pull request has now been integrated.

Changeset: 0d08d735
Author:    Per Liden <pliden at openjdk.org>
URL:       https://git.openjdk.java.net/jdk/commit/0d08d735
Stats:     13 lines in 3 files changed: 7 ins; 1 del; 5 mod

8265702: ZGC on macOS/aarch64

Reviewed-by: erikj, dholmes, stefank, gziemski

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PR: https://git.openjdk.java.net/jdk/pull/3609