[llvm] [NFC][IR] Add CreateCountTrailingZeroElems helper (PR #106711)

[David Sherwood via llvm-commits]

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@@ -1079,6 +1079,14 @@ class IRBuilderBase {
                            nullptr, Name);
   }
 
+  /// Create a call to llvm.experimental_cttz_elts
+  Value *CreateCountTrailingZeroElems(Type *ResTy, Value *Mask,
+                                      const Twine &Name = "") {
+    return CreateIntrinsic(
+        Intrinsic::experimental_cttz_elts, {ResTy, Mask->getType()},
+        {Mask, getInt1(/*ZeroIsPoison=*/true)}, nullptr, Name);
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david-arm wrote:

Good suggestion! Uploaded a new patch.

https://github.com/llvm/llvm-project/pull/106711