[llvm] DAG: Use poison for some load/store offsets in legalizer (PR #167756)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp llvm/lib/Target/ARM/ARMISelLowering.cpp llvm/lib/Target/Hexagon/HexagonISelLoweringHVX.cpp llvm/lib/Target/RISCV/RISCVISelLowering.cpp llvm/lib/Target/X86/X86ISelLowering.cpp --diff_from_common_commit
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``````````diff
diff --git a/llvm/lib/Target/RISCV/RISCVISelLowering.cpp b/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
index 47980b712..3504f6a72 100644
--- a/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
+++ b/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
@@ -23304,11 +23304,10 @@ SDValue RISCVTargetLowering::PerformDAGCombine(SDNode *N,
     SmallVector<int> ShuffleMask;
     if (MGN->getExtensionType() == ISD::NON_EXTLOAD &&
         matchIndexAsShuffle(VT, Index, MGN->getMask(), ShuffleMask)) {
-      SDValue Load = DAG.getMaskedLoad(VT, DL, MGN->getChain(),
-                                       MGN->getBasePtr(), DAG.getPOISON(XLenVT),
-                                       MGN->getMask(), DAG.getUNDEF(VT),
-                                       MGN->getMemoryVT(), MGN->getMemOperand(),
-                                       ISD::UNINDEXED, ISD::NON_EXTLOAD);
+      SDValue Load = DAG.getMaskedLoad(
+          VT, DL, MGN->getChain(), MGN->getBasePtr(), DAG.getPOISON(XLenVT),
+          MGN->getMask(), DAG.getUNDEF(VT), MGN->getMemoryVT(),
+          MGN->getMemOperand(), ISD::UNINDEXED, ISD::NON_EXTLOAD);
       SDValue Shuffle =
         DAG.getVectorShuffle(VT, DL, Load, DAG.getUNDEF(VT), ShuffleMask);
       return DAG.getMergeValues({Shuffle, Load.getValue(1)}, DL);

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https://github.com/llvm/llvm-project/pull/167756