vxlan:optimize cached entry compare
vxlan:optimize cached entry compare

the bihash key compare was doing the extra step of loading both keys into
vector regs and comparing those - instead of using the temporary values
created.

Change-Id: Ic557bfa56cd6aa60c71e7f28c880f85e1eb1e6ec
Signed-off-by: Eyal Bari <fc8b6df29e0d3cf2af21713ee0e85afadbf47bf8@cisco.com>

vpp-dev/vpp,vpp-dev/vpp,vpp-dev/vpp,vpp-dev/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,chrisy/vpp,vpp-dev/vpp,vpp-dev/vpp,FDio/vpp,vpp-dev/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp