[llvm] [TTI] Remove PPC hasActiveVectorLength impl, simplify interface (NFC). (PR #142310)

[Alexey Bataev via llvm-commits]

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@@ -1853,8 +1853,7 @@ class TargetTransformInfo {
   /// in hardware, for the given opcode and type/alignment. (see LLVM Language
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alexey-bataev wrote:

Fix the comment

https://github.com/llvm/llvm-project/pull/142310