[AMDGPU] Set Format/FormatModifier directly instead of per-flag bits, NFC. Remove the now-redundant individual InstSI format flag fields (SOP1/2/C/K/P, VOP1/2/C/VOP3/VINTRP/VOPD3/LDSDIR, the memory formats, Spill, and DPP/SDWA) and have instruction classes set the Format / FormatModifier enum fields directly. The enum fields are packed into TSFlags exactly as before, so this is NFC (the full instruction table is byte-identical). Real instructions copy Format/FormatModifier from their pseudo in the base real classes (kept next to the existing TSFlags copy), so the Format field is now correct on real instructions too. Two derived helper bits (IsVOP3Encoding, VOPD3) are computed from Format for the getVOPe32/getVOPe64 relation maps and the VOPDPairs searchable table; they are not part of TSFlags. Co-Authored-By: Claude <noreply@anthropic.com>
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