[llvm] [AArch64][GISel] Signed comparison using CMN is safe when the subtraction is nsw (PR #150480)

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``````````bash
git-clang-format --diff HEAD~1 HEAD --extensions cpp -- llvm/lib/Target/AArch64/GISel/AArch64GlobalISelUtils.cpp llvm/lib/Target/AArch64/GISel/AArch64InstructionSelector.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Target/AArch64/GISel/AArch64InstructionSelector.cpp b/llvm/lib/Target/AArch64/GISel/AArch64InstructionSelector.cpp
index 61c1c84fb..1614d78ef 100644
--- a/llvm/lib/Target/AArch64/GISel/AArch64InstructionSelector.cpp
+++ b/llvm/lib/Target/AArch64/GISel/AArch64InstructionSelector.cpp
@@ -5160,7 +5160,7 @@ MachineInstr *AArch64InstructionSelector::tryFoldIntegerCompare(
   // cmn z, y
   if (isCMN(RHSDef, P, MRI))
     return emitCMN(LHS, RHSDef->getOperand(2), MIRBuilder);
-  
+
   // Same idea here, but with the LHS of the compare instead:
   // Given this:
   //
@@ -5179,7 +5179,6 @@ MachineInstr *AArch64InstructionSelector::tryFoldIntegerCompare(
     return emitCMN(LHSDef->getOperand(2), RHS, MIRBuilder);
   }
 
-
   // Given this:
   //
   // z = G_AND x, y

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https://github.com/llvm/llvm-project/pull/150480