[llvm] [llubi] Implement experimental vector intrinsics (PR #206899)

[Yingwei Zheng via llvm-commits]

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@@ -810,6 +810,104 @@ class InstExecutor : public InstVisitor<InstExecutor, void>,
     return AnyValue();
   }
 
+  static BooleanKind getMaskLane(const AnyValue &Mask, size_t I) {
+    assert(Mask.isAggregate());
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dtcxzyw wrote:

It is already checked by `asAggregate`.

https://github.com/llvm/llvm-project/pull/206899