[llvm] [LV] Add initial support for partial alias masking (PR #177599)

[Florian Hahn via llvm-commits]

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@@ -278,6 +278,13 @@ struct VPTransformState {
     Iter->second[CacheIdx] = V;
   }
 
+  /// Returns the runtime clamped VF (or nullptr if the VF is not clamped).
+  Value *getRTClampedVF() {
+    if (!ClampedVF)
+      return nullptr;
+    return get(ClampedVF, /*IsScalar=*/true);
+  }
+
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fhahn wrote:

Can we avoid this by instead adding the VF as operand to the required recipes, then have them handled like any other recipe?

If that's possible, this could probably be done as NFC change 

https://github.com/llvm/llvm-project/pull/177599