[llvm] [AArch64] Allow commuting the cmn if both sides of the comparison can be negated (PR #146233)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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``````````bash
git-clang-format --diff HEAD~1 HEAD --extensions cpp -- llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp b/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
index 09fbafdfb..3007089cb 100644
--- a/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
+++ b/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
@@ -3446,7 +3446,8 @@ static SDValue emitStrictFPComparison(SDValue LHS, SDValue RHS, const SDLoc &DL,
 }
 
 static SDValue emitComparison(SDValue LHS, SDValue RHS, ISD::CondCode &CC,
-                              const SDLoc &DL, AArch64CC::CondCode &OutCC, SelectionDAG &DAG) {
+                              const SDLoc &DL, AArch64CC::CondCode &OutCC,
+                              SelectionDAG &DAG) {
   EVT VT = LHS.getValueType();
   const bool FullFP16 = DAG.getSubtarget<AArch64Subtarget>().hasFullFP16();
 
@@ -3976,8 +3977,8 @@ static SDValue getAArch64Cmp(SDValue LHS, SDValue RHS, ISD::CondCode CC,
             DAG.getNode(ISD::SIGN_EXTEND_INREG, DL, LHS.getValueType(), LHS,
                         DAG.getValueType(MVT::i16));
         Cmp = emitComparison(
-            SExt, DAG.getSignedConstant(ValueofRHS, DL, RHS.getValueType()), CC, Arch64CC,
-            DL, DAG);
+            SExt, DAG.getSignedConstant(ValueofRHS, DL, RHS.getValueType()), CC,
+            Arch64CC, DL, DAG);
       }
     }
 

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https://github.com/llvm/llvm-project/pull/146233