RFR: 8148507: [JVMCI] mitigate deadlocks related to JVMCI compiler under -Xbatch

[Christian Thalinger]

Looks good to me.  David, any comments?

> On Feb 4, 2016, at 12:36 PM, Doug Simon <doug.simon at oracle.com> wrote:
> 
> I’ve updated the webrev in situ for reasons discussed here:
> 
> https://bugs.openjdk.java.net/browse/JDK-8148507?focusedCommentId=13896252&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13896252
> 
> 
>> On 03 Feb 2016, at 20:42, Christian Thalinger <christian.thalinger at oracle.com> wrote:
>> 
>> There was some discussion in the bug report but I seems like we are going to integrate this change.
>> 
>>> On Jan 31, 2016, at 5:48 AM, Christian Thalinger <christian.thalinger at oracle.com> wrote:
>>> 
>>> Looks good.
>>> 
>>>> On Jan 29, 2016, at 4:34 PM, Doug Simon <doug.simon at oracle.com> wrote:
>>>> 
>>>> Please review this small change to further mitigate deadlocks that can be caused by JVMCI when BackgroundCompilation is disabled.
>>>> 
>>>> https://bugs.openjdk.java.net/browse/JDK-8148507
>>>> http://cr.openjdk.java.net/~dnsimon/8148507
>>>> 
>>>> -Doug
>>> 
>> 
>