[PATCH] D133636: [M68k] Fix the crash of fast register allocator

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The assumption that the size of the stack slot for spilled register is 4 bytes isn't implemented in M68kRegisterInfo.td.

      

Fixes #57660


https://reviews.llvm.org/D133636

Files:
  llvm/lib/Target/M68k/M68kRegisterInfo.td
  llvm/test/CodeGen/M68k/fast-regalloc.ll

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