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subx: extract helpers for 'push' and 'pop'. We will be using them in
'call' and 'ret' as well.
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subx: 'pop'
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subx: correct a 'copy' ('mov') instruction as well to get its operand
right from the opcode.
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subx: correct 'push' register. It gets its operand right from the
opcode, not a new modrm byte.
Have I misinterpreted any other instructions in this manner (`+rd` in
the Intel manual)?
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subx: 'pop'
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subx: 'mov'
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I spent a while spelunking into the code generated by C compilers before
realizing that ignoring the order of arguments for 'cmp' instructions
clarifies everything.
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subx: 'compare'
Hopefully I've implemented the 'sense' of comparisons right..
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subx: 'or'
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subx: Implement 'and' for the addressing modes we've built so far.
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subx: Move register direct mode before indirect in the exposition.
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