ETH:optimized double is_tagged check
ETH:optimized double is_tagged check

a double version of is_tagged, uses "free lanes" in _mm_cmpeq_epi16
to check a second tag

this code was not yet tested for performance

Change-Id: I640017e1cc75c85a33d196ee911a7e4a512d9849
Signed-off-by: Eyal Bari <fc8b6df29e0d3cf2af21713ee0e85afadbf47bf8@cisco.com>

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