[clang] [clang-tools-extra] [llvm] [VPlan] Update VPInst::onlyFirstLaneUsed to check users. (PR #80269)

[Florian Hahn via cfe-commits]

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@@ -1256,23 +1256,7 @@ class VPInstruction : public VPRecipeWithIRFlags {
     }
   }
 
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fhahn wrote:

Added back, thanks!

https://github.com/llvm/llvm-project/pull/80269