RFR: Bulk backports jdk12 -> sh/jdk11

[Roman Kennke]

Including Andrew H...

> On 3/11/19 9:29 PM, Roman Kennke wrote:
>> This backports all relevant Shenandoah changes (I hope) from jdk-updates/jdk12u to shenandoah/jdk11.
>>
>> They all applied mostly clean and trivial. Builds and tests look good.
>>
>> List of changes:
>> http://cr.openjdk.java.net/~rkennke/upstream-jdk11-merge-2019-03-11/changes.txt
>>
>> Full webrev:
>> http://cr.openjdk.java.net/~rkennke/upstream-jdk11-merge-2019-03-11/webrev.00/
> 
> Looks good to me. Thanks!
> 
> Hold on for a minute, though.
> 
> Andrew Hughes, notice the synopsis format for the changes:
>   [backport] $BUGID $SYNOPSIS
> 
> This is almost the same as we did over the years for Shenandoah-specific backports, but now it also
> mentions $BUGID, because Shenandoah is finally upstream. We would like to separate backports that
> are coming to our downstream version of Shenandoah versus the upstream changes (especially those
> coming via 11u updates), therefore Shenandoah-specific backports done by Shenandoah devs start with
> "[backport]". This would also avoid these backports to be accidentally matched by jcheck and/or
> hgupdater.
> 
> Does it make sense to you?
> 
> -Aleksey
>