Fix mask calculation for concat operator in bmv2/dpdk expression lowering #3911
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bit<16> word0 = hdr.ipv4.version_ihl ++ hdr.ipv4.diffserv;
is translated to
word0_0 = (bit<16>)hdr.ipv4.version_ihl << 8 | (bit<16>)hdr.ipv4.diffserv & 16w0x1ff;
The mask value should be 0xff instead of 0x1ff