[llvm] [LV][RISCV] Add explicit LMUL controls via computeFeasibleMaxVF (PR #193091)

[Florian Hahn via llvm-commits]

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@@ -3335,6 +3335,13 @@ FixedScalableVFPair LoopVectorizationCostModel::computeFeasibleMaxVF(
   }
   auto MaxSafeFixedVF = ElementCount::getFixed(MaxSafeElementsPowerOf2);
   auto MaxSafeScalableVF = getMaxLegalScalableVF(MaxSafeElementsPowerOf2);
+  auto CollectMaxScalableVF = TTI.getMaxScalableVF(WidestType);
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fhahn wrote:

How will this interact with the maximize bandwidth option, which also maximizes the VF? Might be good to have a test

https://github.com/llvm/llvm-project/pull/193091