[llvm] [AArch64][SelectionDAG] Do not fold if not one-use (PR #167371)

[Simon Pilgrim via llvm-commits]

https://github.com/RKSimon requested changes to this pull request.

Please take a look at the CI failures:
```
Failed Tests (4):
  LLVM :: CodeGen/AArch64/masked-sdiv-fixed-length.ll
  LLVM :: CodeGen/AArch64/masked-srem-fixed-length.ll
  LLVM :: CodeGen/AArch64/masked-udiv-fixed-length.ll
  LLVM :: CodeGen/AArch64/masked-urem-fixed-length.ll
```

https://github.com/llvm/llvm-project/pull/167371