RFR: 8241234: Unify monitor enter/exit runtime entries

[Yudi Zheng]

Hi Tobias,

Thanks for the review!

-Yudi

> On 23 Mar 2020, at 08:51, Tobias Hartmann <tobias.hartmann at oracle.com> wrote:
> 
> Hi Yudi,
> 
> looks good to me.
> 
> Best regards,
> Tobias
> 
> On 20.03.20 16:03, Yudi Zheng wrote:
>> Hello,
>> 
>> Please review this patch that unifies the monitor enter/exit runtime entries used by C1, C2, and JVMCI.
>> 
>> https://bugs.openjdk.java.net/browse/JDK-8061553 added support for faster "slow" locking paths. 
>> These paths are not currently used by JVMCI (or C1) leading to slower performance on programs 
>> that have a lot of short lived locked sections (such as dacapo:h2). 
>> 
>> This patch creates helper methods based on C2’s monitor enter/exit entries, and shares with the C1, 
>> JVMCI runtimes. It will prevent these runtimes from missing future updates.
>> 
>> https://bugs.openjdk.java.net/browse/JDK-8241234
>> http://cr.openjdk.java.net/~yzheng/8241234/webrev.00/
>> 
>> Many thanks,
>> Yudi
>>