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`apply_disp_scale` forgot that `wrapping_mul` exists, so we don't need
to explicitly write the size of value that `mem_size` should be cast to,
in casting to/from a signed integer. taken with `.into()`, we don't need
per-architecture stubs to make evex decoding work.
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the evex route would allow "valid" instructions that have the opcode
`invalid`. this is.. not correct.
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also remove redundant assignments of operand_count and some OperandSpec,
bulk-assign all registers and operands on entry to `read_instr`. this
all, taken together, shaves off about 7 cycles per decode.
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