Lioncash 8c4aa133ca Interpreter_FloatingPoint: Handle NaN flag setting within fctiw and fctiwz
If a NaN of any type is passed as the operand to either of these
instructions, we shouldn't go down the regular code path, as we end up
potentially setting the wrong flags. For example, we wouldn't set the
FPSCR.VXCVI bit properly. We'd also set FPSCR.FI, when in actuality it
should be unset.

If an SNaN is passed as an operand, we also need to set the FPSCR.VXSNAN
bit as well.

The flag setting behavior for these can be found in Appendix C.4.2 in
PowerPC Microprocessor Family: The Programming Environments Manual for
32 and 64-bit Microprocessors.
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