[llvm] [AArch64] optimise SVE cmp intrinsics with no active lanes (PR #104779)

[Paul Walker via llvm-commits]

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@@ -1160,6 +1160,10 @@ static std::optional<Instruction *> instCombineSVECmpNE(InstCombiner &IC,
                                                         IntrinsicInst &II) {
   LLVMContext &Ctx = II.getContext();
 
+  // Replace by zero constant when all lanes are inactive
+  if (auto II_NA = instCombineSVENoActiveUnaryZero(IC, II))
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paulwalker-arm wrote:

Not relevant to this PR but `instCombineSVENoActiveUnaryZero` seems like a bad name given the context in which the function is now used. Do you mind committing a NFC rename patch to something like `instCombineSVENoActiveLanes`?

https://github.com/llvm/llvm-project/pull/104779