[llvm] [LV] Allow partial reductions with an extended bin op (PR #165536)

[Sam Tebbs via llvm-commits]

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@@ -7994,6 +8005,14 @@ bool VPRecipeBuilder::getScaledReductions(
 
       ExtOpTypes[I] = ExtOp->getType();
       ExtKinds[I] = TTI::getPartialReductionExtendKind(Exts[I]);
+      // Make sure that the outer extend is either sext or the same kind as the
+      // inner extend.
+      if (OuterExtKind.has_value()) {
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SamTebbs33 wrote:

It looks like that's actually crashing on main as well, and is fixed by https://github.com/llvm/llvm-project/pull/162822.

https://github.com/llvm/llvm-project/pull/165536