Implement remaining x87 alias encodings
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Description
#5289 implemented the alias encodings for FCOM and FCOMP, but according to wikipedia there are more.
We should implement FSTP, FXCHG, FCOMP (0xDE 0xD0+i), and also `FSTPNCE`?
- FSTPNCE is a weird one and will need a bit more investigation.
As long as they are tested in CI on an x86 host then we can be reasonably sure they're real.
See this wikipedia page for more information. https://en.wikipedia.org/wiki/List_of_x86_instructions#cite_note-x87_alias-346
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