[llvm] [AMDGPU] HasOneUse uses (PR #92534)

[via llvm-commits]

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@@ -884,6 +884,9 @@ class PatFrags<dag ops, list<dag> frags, code pred = [{}],
   // If set to true, a predicate is added that checks for the absence of use of
   // the first result.
   bit HasNoUse = ?;
+  // If set to true, a predicate is added that checks for the sole use of
+  // the first result.
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jofrn wrote:

dag emitter checks `hasOneUse()` though. This file is generic to both emitters.

Also, `GIM_CheckHasNoUse` is implemented with `use_nodbg_empty`, yet the comment above `bit HasNoUse = ?;` has non-debug users as implicit.

https://github.com/llvm/llvm-project/pull/92534