powerpc/8xx: Optimize verification in FixupDAR
powerpc/8xx: Optimize verification in FixupDAR

By XORing the upper part of the instruction code, we get a value that can
directly be verified with the second test and we can remove the first test.

Signed-off-by: Christophe Leroy <4e2d3d12816ace76f1cfa36c1816509bd24cf089@c-s.fr>
Signed-off-by: Scott Wood <b77916c2feab81a70245e7b5671f4f02730ebf64@freescale.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs