RFR: C2: Fix hoisting of loadbarriers out of strip mined loops

[Nils Eliasson]

This issue was encountered running Dacapo/fop.

On 2018-04-10 10:45, Nils Eliasson wrote:
> Hi,
>
> The hoisting of loadbarriers out of loops isn't loop strip mining 
> aware. This can lead to getting loadbarriers between the inner and 
> outer loops. This patch fixes this.
>
> Webrev: 
> http://cr.openjdk.java.net/~neliasso/zgc/move_out_of_loop/webrev.01
>
> Regards,
>
> Nils Eliasson
>