RFR: 8202976: Add C1 lea patching support for x86

[Vladimir Kozlov]

Good.

thanks,
Vladimir

On 5/11/18 1:14 AM, Per Liden wrote:
> This patch adds C1 support for patching lea instructions on x86. This is used in ZGC load barrier stubs, when a load 
> barrier is applied to a field load with a not-yet-unknown offset.
> 
> Bug: https://bugs.openjdk.java.net/browse/JDK-8202976
> Webrev: http://cr.openjdk.java.net/~pliden/8202976/webrev.0
> 
> Testing: passes hs-tier{1,2}, this patch has also been used and tested in the ZGC repository for more than 3 years.
> 
> /Per