[llvm] [RISCV][TTI] Use processShuffleMask for shuffle legalization estimate (PR #136191)

[Craig Topper via llvm-commits]

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@@ -383,6 +383,61 @@ static VectorType *getVRGatherIndexType(MVT DataVT, const RISCVSubtarget &ST,
   return cast<VectorType>(EVT(IndexVT).getTypeForEVT(C));
 }
 
+/// Attempt to approximate the cost of a shuffle which will require splitting
+/// during legalization.  Note that processShuffleMasks is not an exact proxy
+/// for the algorithm used in LegalizeVectorTypes, but hopefull it's a
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topperc wrote:

hopefull -> hopefully

https://github.com/llvm/llvm-project/pull/136191