Integrated: 8254075: Shenandoah: Remove ShenandoahCodeRootsStyle diagnostic flag and related test

[Zhengyu Gu]

On Tue, 6 Oct 2020 13:40:02 GMT, Zhengyu Gu <zgu at openjdk.org> wrote:

> Shenandoah introduced fast code roots iteration (ShenandoahCodeRootsStyle = 2), also kept 2 additional iteration
> mechanism (ShenandoahCodeRootsStyle = 0 and 1), mainly for verification purpose.
> Today, Shenandoah normally iterates code roots concurrently using style 2, while style 0 and 1 require safepoints, that
> makes style 0 and 1 verification less useful. Besides, Shenandoah has much improved verifier, more suitable for the
> purpose.  Let's remove this diagnostic flag and related test.
> 
> Test:
> 
> - [x] hotspot_gc_shenandoah

This pull request has now been integrated.

Changeset: 51fdb4c0
Author:    Zhengyu Gu <zgu at openjdk.org>
URL:       https://git.openjdk.java.net/jdk/commit/51fdb4c0
Stats:     141 lines in 5 files changed: 0 ins; 129 del; 12 mod

8254075: Shenandoah: Remove ShenandoahCodeRootsStyle diagnostic flag and related test

Reviewed-by: shade

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PR: https://git.openjdk.java.net/jdk/pull/524