[11] RFR: 2020-04-15, Bulk backports to sh/jdk11

[Aleksey Shipilev]

On 4/15/20 10:16 PM, Zhengyu Gu wrote:
> http://cr.openjdk.java.net/~zgu/sh-jdk11u-20200415/webrev.00/
> 
> Backport from jdk to shenandoah-jdk11u
> 
> [backport] 8237396: JvmtiTagMap::weak_oops_do() should not trigger
>                      barriers

This one would come through 11.0.8 integration, we should not backport it ourselves.

> [backport] 8241900: Loop unswitching may cause dependence on null check
>                      to be lost

This one should be backported through upstream 11u, we should not backport it ourselves.

Others look fine.

-- 
Thanks,
-Aleksey