RFR: 8220501: Improve c1_ValueStack locks handling

[Tobias Hartmann]

Hi Claes,

looks good to me.

Best regards,
Tobias

On 12.03.19 13:52, Claes Redestad wrote:
> Hi,
> 
> the _locks Values in ValueStack is often empty/unused, and allocating it
> lazily is a small startup/warmup optimization.
> 
> Webrev: http://cr.openjdk.java.net/~redestad/8220501/open.00/
> Bug:    https://bugs.openjdk.java.net/browse/JDK-8220501
> 
> Testing: tier1-3
> 
> Thanks!
> 
> /Claes