[llvm] [InstCombine] Drop wrong ninf for `(-X / Y) + Z` (PR #228684)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp b/llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp
index f1e75efa5..484121273 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp
@@ -2171,9 +2171,9 @@ Instruction *InstCombinerImpl::visitFAdd(BinaryOperator &I) {
     Value *RHS = I.getOperand(1);
     BinaryOperator *DivInst;
     if (auto *Inst = dyn_cast<BinaryOperator>(LHS)) {
-        DivInst = Inst;
+      DivInst = Inst;
     } else {
-        DivInst = cast<BinaryOperator>(RHS);
+      DivInst = cast<BinaryOperator>(RHS);
     }
     Value *XY = Builder.CreateFDivFMF(X, Y, DivInst);
     return BinaryOperator::CreateFSubFMF(Z, XY, &I);

``````````

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https://github.com/llvm/llvm-project/pull/228684