[NFCI][MC][DecoderEmitter] Fix BitWidth for fixed length inst encodings (#154934) Change `InstructionEncoding` to use `Size` field to derive the BitWidth for fixed length instructions as opposed to the number of bits in the `Inst` field. For some backends, `Inst` has more bits than `Size`, but `Size` is the true size of the instruction. Also add validation that `Inst` has at least `Size * 8` bits and any bits in `Inst` beyond that are either 0 or unset. Verified no change in generated *GenDisassembler.inc files before/after.
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