[llvm] [IA] Generalize the support for power-of-two (de)interleave intrinsics (PR #123863)

[Luke Lau via llvm-commits]

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@@ -3172,11 +3171,10 @@ class TargetLoweringBase {
   ///
   /// \p II is the interleave intrinsic.
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lukel97 wrote:

Nit, we can remove the II doc comment now

https://github.com/llvm/llvm-project/pull/123863