[llvm] [VPlan] Set debug location for VPReduction/VPWidenPHI/VPWidenIntrinsicRecipe. (PR #120054)

[Florian Hahn via llvm-commits]

================
@@ -54,6 +54,31 @@ exit:
   ret void
 }
 
+define void @widen_intrinsic_dbg(i64 %n, ptr %y, ptr %x) nounwind uwtable {
+; DEBUGLOC-LABEL: define void @widen_intrinsic_dbg(
+; DEBUGLOC: vector.body:
+; DEBUGLOC:  = call <4 x float> @llvm.sqrt.v4f32(<4 x float> %{{.+}}), !dbg ![[INTRINSIC_LOC:[0-9]+]]
+; DEBUGLOC: for.body:
+; DEBUGLOC: %call = tail call float @llvm.sqrt.f32(float %lv) #2, !dbg ![[INTRINSIC_LOC]]
+;
+entry:
+  %cmp6 = icmp sgt i64 %n, 0
+  br i1 %cmp6, label %for.body, label %for.end
+
+for.body:
+  %iv = phi i64 [ %iv.next, %for.body ], [ 0, %entry ]
+  %arrayidx = getelementptr inbounds float, ptr %y, i64 %iv
+  %lv = load float, ptr %arrayidx, align 4
+  %call = tail call float @llvm.sqrt.f32(float %lv) nounwind readnone
+  %arrayidx2 = getelementptr inbounds float, ptr %x, i64 %iv
----------------
fhahn wrote:

```suggestion
  %gep.x = getelementptr inbounds float, ptr %x, i64 %iv
```

https://github.com/llvm/llvm-project/pull/120054