[llvm] [SandboxVec][BottomUpVec] Improve handling of external uses (PR #185468)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions h,cpp -- llvm/include/llvm/Transforms/Vectorize/SandboxVectorizer/InstrMaps.h llvm/include/llvm/Transforms/Vectorize/SandboxVectorizer/Passes/BottomUpVec.h llvm/lib/Transforms/Vectorize/SandboxVectorizer/Passes/BottomUpVec.cpp llvm/unittests/Transforms/Vectorize/SandboxVectorizer/InstrMapsTest.cpp --diff_from_common_commit
``````````

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``````````diff
diff --git a/llvm/lib/Transforms/Vectorize/SandboxVectorizer/Passes/BottomUpVec.cpp b/llvm/lib/Transforms/Vectorize/SandboxVectorizer/Passes/BottomUpVec.cpp
index 5fda77577..ca187df47 100644
--- a/llvm/lib/Transforms/Vectorize/SandboxVectorizer/Passes/BottomUpVec.cpp
+++ b/llvm/lib/Transforms/Vectorize/SandboxVectorizer/Passes/BottomUpVec.cpp
@@ -373,8 +373,8 @@ void BottomUpVec::emitUnpacksForExternalUses(const ArrayRef<Value *> Bndl,
             ConstantInt::getSigned(Type::getInt32Ty(Ctx), Idx++);
         // This may be folded into a Constant if LastInsert is a Constant. In
         // that case we only collect the last constant.
-        auto *Extract = ExtractElementInst::create(Vec, ExtractLaneC,
-                                               WhereIt, Ctx, "UnPack");
+        auto *Extract = ExtractElementInst::create(Vec, ExtractLaneC, WhereIt,
+                                                   Ctx, "UnPack");
         // Move WhereIt to prepare for the next Extract.
         if (auto *ExtractI = dyn_cast<Instruction>(Extract))
           WhereIt = std::next(ExtractI->getIterator());

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https://github.com/llvm/llvm-project/pull/185468