[llvm] [SLP]Emit actual bitwidth for analyzed MinBitwidth nodes, NFCI. (PR #71536)

[Simon Pilgrim via llvm-commits]

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@@ -7892,6 +7892,30 @@ BoUpSLP::getEntryCost(const TreeEntry *E, ArrayRef<Value *> VectorizedVals,
       continue;
     UsedScalars.set(I);
   }
+  auto GetCastGontextHint = [&](Value *V) {
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RKSimon wrote:

GetCastGontextHint -> GetCastContextHint

https://github.com/llvm/llvm-project/pull/71536