[llvm] [indvars] Support known positive extends in getExtendedOperandRecurrence (PR #70990)

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``````````bash
git-clang-format --diff dba04bbcf47007bb57f4686f10b55455cbbad84e 108b56c66e748721200626cd412b700cac484ff5 -- llvm/lib/Transforms/Utils/SimplifyIndVar.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Transforms/Utils/SimplifyIndVar.cpp b/llvm/lib/Transforms/Utils/SimplifyIndVar.cpp
index a3763c406884..1ac8b1feb42e 100644
--- a/llvm/lib/Transforms/Utils/SimplifyIndVar.cpp
+++ b/llvm/lib/Transforms/Utils/SimplifyIndVar.cpp
@@ -1392,11 +1392,11 @@ WidenIV::getExtendedOperandRecurrence(WidenIV::NarrowIVDefUse DU) {
     if (OBO->hasNoSignedWrap()) {
       ExtKind = ExtendKind::Sign;
       ExtendOperExpr = SE->getSignExtendExpr(
-        SE->getSCEV(DU.NarrowUse->getOperand(ExtendOperIdx)), WideType);
+          SE->getSCEV(DU.NarrowUse->getOperand(ExtendOperIdx)), WideType);
     } else if (OBO->hasNoUnsignedWrap()) {
       ExtKind = ExtendKind::Zero;
       ExtendOperExpr = SE->getZeroExtendExpr(
-        SE->getSCEV(DU.NarrowUse->getOperand(ExtendOperIdx)), WideType);
+          SE->getSCEV(DU.NarrowUse->getOperand(ExtendOperIdx)), WideType);
     } else
       return {nullptr, ExtendKind::Unknown};
   } else

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https://github.com/llvm/llvm-project/pull/70990