RFR (S): Combine matching rules for comparison operations on x86

[Kharbas, Kishor]

Hi,
Requesting review for the patch to reduce the number of rules in x86 ad file for compares.
This is done by taking the comparison operations as input to the vector node.

http://cr.openjdk.java.net/~kkharbas/vector-api/compares_reduction/webrev.00/webrev/

All tests pass on Intel CLX for AVX=0,1,2,3.

Thanks,
Kishor