These are fairly popular so not having them around is causing headaches.
We will really want these in the future to use the host register, btu
that is more time consuming than I want to dedicate to at the moment.
So the FCMP instruction must be told which flags to generate up front,
then it generates the flags in to a GPR which are then tracked and
pulled out with a specific IR op.
This can be augmented in the future to more easily RA the host flag
register
In some places, Neg meant logical one's complement negation.
In others it meant arithmetic two's complement negation.
As both x87 and aarch64 have neg instructions that do
two's complement negations, we will standardise on that.
Additionally we will add a Not_IR op for one's complement
Ryan Houdek