bifrost: Support 64-bit clauses
There is a special 64-bit clause type which can only consist of instructions acting on 64-bit registers. The register field of each instruction in a 64-bit clause is interpreted entirely differently. We extend RegCtrl to include everything in the original Regs bitfield, so that we don't have to poke the original bitfield after decoding it, since that wouldn't work for 64-bit clauses. We then add a new Regs64 bitfield and DecodeRegCtrl64() function to decode the new format, and make sure to call it for 64-bit clauses.
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