[llvm] [LV] Autovectorization for the all-in-one histogram intrinsic (PR #91458)

[Paschalis Mpeis via llvm-commits]

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@@ -8523,6 +8561,12 @@ VPRecipeBuilder::tryToCreateWidenRecipe(Instruction *Instr,
   if (auto *CI = dyn_cast<CallInst>(Instr))
     return tryToWidenCall(CI, Operands, Range);
 
+  if (StoreInst *SI = dyn_cast<StoreInst>(Instr)) {
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paschalis-mpeis wrote:

nit, IFF you fancy something like below better:
```cpp
  if (StoreInst *SI = dyn_cast<StoreInst>(Instr))
    if (auto HI = Legal->getHistogramForStore(SI))
      return tryToWidenHistogram(*HI, Operands);
```

https://github.com/llvm/llvm-project/pull/91458