[llvm-branch-commits] [llvm] AMDGPU: Reduce 64-bit add width if high bits are known 0 (PR #122049)

[Matt Arsenault via llvm-branch-commits]

arsenm wrote:

> [!WARNING]
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> open. Once all requirements are satisfied, merge this PR as a stack <a 
> href="https://app.graphite.dev/github/pr/llvm/llvm-project/122049?utm_source=stack-comment-downstack-mergeability-warning";
>  >on Graphite</a>.</b>
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https://github.com/llvm/llvm-project/pull/122049
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