Ask for review: Optimise unsigned comparison pattern

[Quân Anh Mai]

Hi,

I have submitted a small patch that changes the patterns x +-
Integer.MIN_VALUE <=> y +- Integer.MIN_VALUE to x u<=> y. This pattern is
used in java.lang.Integer.compareUnsigned. I would be appreciated it if
someone could take a look at it.

Thank you very much. The pull request is here:
https://github.com/openjdk/jdk/pull/6101.

Regards,
Quân Anh