x86: template-ize vector packed dword/qword integer insns

x86: template-ize vector packed dword/qword integer insns

Many of the vector integer insns come in dword/qword element pairs. Most
of these pairs follow certain encoding patterns. Introduce a "dq"
template to reduce redundancy.

Note that in the course of the conversion
- a few otherwise untouched templates are moved, so they end up next to
  their siblings),
- drop an unhelpful Cpu64 from the GPR form of VPBROADCASTQ, matching
  what we already have for KMOVQ - the diagnostic is better this way for
  insns with multiple forms (i.e. the same Cpu64 attributes on {,V}MOVQ,
  {,V}PEXTRQ, and  {,V}PINSRQ are useful to keep),
- this adds benign/meaningless IgnoreSize attributes to the GPR forms of
  KMOVD and VPBROADCASTD; it didn't seem worth avoiding this.