[llvm] [SystemZ] Use getSignedConstant() where necessary (PR #117181)

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``````````bash
git-clang-format --diff 22fdc57140283d053207ea5763dc03ec7770a8ff c1ff71800992fdaa487a60e1c8e8acf61167b7b4 --extensions cpp -- llvm/lib/Target/SystemZ/SystemZISelDAGToDAG.cpp llvm/lib/Target/SystemZ/SystemZISelLowering.cpp llvm/lib/Target/SystemZ/SystemZSelectionDAGInfo.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Target/SystemZ/SystemZISelLowering.cpp b/llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
index daacbd4220..8f505b7e19 100644
--- a/llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
+++ b/llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
@@ -3410,7 +3410,7 @@ SDValue SystemZTargetLowering::lowerVectorSETCC(SelectionDAG &DAG,
   }
   if (Invert) {
     SDValue Mask =
-      DAG.getSplatBuildVector(VT, DL, DAG.getAllOnesConstant(DL, MVT::i64));
+        DAG.getSplatBuildVector(VT, DL, DAG.getAllOnesConstant(DL, MVT::i64));
     Cmp = DAG.getNode(ISD::XOR, DL, VT, Cmp, Mask);
   }
   if (Chain && Chain.getNode() != Cmp.getNode()) {

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https://github.com/llvm/llvm-project/pull/117181