[llvm] [LV]Support dropping of nneg flag for zext widencast recipes. (PR #74112)

[Philip Reames via llvm-commits]

================
@@ -971,6 +985,10 @@ class VPRecipeWithIRFlags : public VPRecipeBase {
       I->setHasAllowContract(FMFs.AllowContract);
       I->setHasApproxFunc(FMFs.ApproxFunc);
       break;
+    case OperationType::CastOp:
+      if (isa<ZExtInst>(I))
+        I->setNonNeg(CastFlags.NonNeg);
----------------
preames wrote:

See PossiblyNonNegInst

https://github.com/llvm/llvm-project/pull/74112