[llvm] [Attributor] Propagate alignment through ptrmask (PR #150158)

[Matt Arsenault via llvm-commits]

================
@@ -5203,6 +5256,8 @@ static unsigned getKnownAlignForUse(Attributor &A, AAAlign &QueryingAA,
       TrackUse = true;
     return 0;
   }
+  if (const IntrinsicInst *II = dyn_cast<IntrinsicInst>(I))
+    return getKnownAlignForIntrinsic(A, QueryingAA, II).value();
----------------
arsenm wrote:

```suggestion
    return getKnownAlignForIntrinsic(A, QueryingAA, *II).value();
```

https://github.com/llvm/llvm-project/pull/150158