[llvm] [IR][DAG] Add support for `nneg` flag with `uitofp` (PR #86141)

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``````````bash
git-clang-format --diff 3fefeafa49299ef924414bfa1b678e0f656b3618 156943d609123a12fc507f018f3798a090b8d944 -- llvm/include/llvm/CodeGen/TargetLowering.h llvm/include/llvm/IR/IRBuilder.h llvm/include/llvm/IR/InstrTypes.h llvm/lib/AsmParser/LLParser.cpp llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp llvm/lib/IR/Instruction.cpp llvm/lib/IR/Operator.cpp
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View the diff from clang-format here.
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diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index 7b5055f59d..4cebc8df96 100644
--- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -4019,13 +4019,13 @@ SDValue DAGCombiner::visitSUB(SDNode *N) {
   }
 
   // smax(a,b) - smin(a,b) --> abds(a,b)
-  if (hasOperation(ISD::ABDS, VT)  &&
+  if (hasOperation(ISD::ABDS, VT) &&
       sd_match(N0, m_SMax(m_Value(A), m_Value(B))) &&
       sd_match(N1, m_SMin(m_Specific(A), m_Specific(B))))
     return DAG.getNode(ISD::ABDS, DL, VT, A, B);
 
   // umax(a,b) - umin(a,b) --> abdu(a,b)
-  if (hasOperation(ISD::ABDU, VT)  &&
+  if (hasOperation(ISD::ABDU, VT) &&
       sd_match(N0, m_UMax(m_Value(A), m_Value(B))) &&
       sd_match(N1, m_UMin(m_Specific(A), m_Specific(B))))
     return DAG.getNode(ISD::ABDU, DL, VT, A, B);

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https://github.com/llvm/llvm-project/pull/86141