[PATCH] D148255: [m68k] Add basic support for floating point arithmetic instruction

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This patch adds support for fneg, fabs, fadd, fsub, fdiv, fmul.

Note that this only adds freg->freg addressing mode. memory->reg address mode will be introduced once the infrastructure is ready.


https://reviews.llvm.org/D148255

Files:
  llvm/lib/Target/M68k/M68kInstrArithmetic.td
  llvm/test/MC/M68k/Arith/Classes/MxFBinary_FF.s
  llvm/test/MC/M68k/Arith/Classes/MxFUnary_FF.s

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