[PATCH] D82254: [RISCV] Simplify calling use_empty()

[Fangrui Song via Phabricator via llvm-commits]

MaskRay added a comment.

The API is actually different: `SDNode::use_empty` checks uses while `SDValue::use_empty` only checks uses of the return value. The former is more efficient. I think it is possible that `SDValue::use_empty` can be used instead but I am not sure this entails a change.

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