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

[Doug Simon]

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
>> 
>