Min-Yih Hsu aee4399f58 [M68k] Add subtarget features for M68881/2 FPU
Note that technically both M68000/010 can use M68881, despite the fact
that usually only M68020 and newer ISAs are equipped with M68881/2.
M68040 and newer processors have builtin M68882.

Differential Revision: https://reviews.llvm.org/D147479
2023-04-06 11:09:23 -07:00
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