'mov $~0x80000000, %r; ror x, %r' is shorter than 'mov $0x80000000, %r; shr x, %r; not %r'.

'mov $~1, %r; rol x, %r' is shorter than 'mov $1, %r; shl x, %r; not %r'.

'thunk' is the current and default style to get the ip.
'pop' is the old way using 'call base; base: pop %reg'.

This makes them easier to read and avoids markdown interpreting __xxx__
as bold.

Now every bit in the public API is documented so we can enable doxygen
warnings for undocumented members.

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