Currently only support partially ignoring for overlay 0x66, this means
we only support no overlay at all and 0x66. Using only two bits of flag
space rather than 3.
If we find an instruction family that supports a different one then we
should break it out to three independent flags. Keeping it two until
then
Unit tests to ensure this keeps working is forthcoming
These instructions treat the immediate encoding differently depending on
the operating size of the instruction
For 16bit and 32bit operation they treat the immediate as an
appropriately sized immediate.
For 64bit operand size the immediate is sign extended to handle the new
operating width.
CMP was previously set to SEXT for this which would have its own set of
problems handling it like that.
Ryan Houdek