[llvm] [LoopVectorize] Enable vectorisation of early exit loops with live-outs (PR #120567)

[Florian Hahn via llvm-commits]

================
@@ -697,14 +697,21 @@ Value *VPInstruction::generate(VPTransformState &State) {
     Value *A = State.get(getOperand(0));
     return Builder.CreateOrReduce(A);
   }
-
+  case VPInstruction::ExtractFirstActive: {
+    Value *Vec = State.get(getOperand(0));
+    Value *Mask = State.get(getOperand(1));
+    Value *Ctz =
+        Builder.CreateCountTrailingZeroElems(Builder.getInt64Ty(), Mask);
+    return Builder.CreateExtractElement(Vec, Ctz);
----------------
fhahn wrote:

nit: might be helpful for IR readability to use IR value names here

https://github.com/llvm/llvm-project/pull/120567