RFR(XS): 8211451: ~2.5% regression on compression benchmark starting with 12-b11

[Roland Westrelin]

> Right, it is not infinite but the issue here is not how many iterations we run but validity of checks in generated code 
> we will add during counted loop optimizations (iteration splitting, unrolling, ...). Do we execute loop optimization if 
> condition is 'ne'?

We do. In the method where the regression shows up, the loop is unrolled
for instance.

Roland.