[llvm] [DAGCombiner] Move handling of atomic loads from SystemZ to DAGCombiner (NFC). (PR #86484)

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``````````bash
git-clang-format --diff 57146daeaaf366050dc913db910fcc2995a3e06d 03d742dfaca8ddbeb1f589f94699f40e601c2094 -- llvm/include/llvm/CodeGen/TargetLowering.h llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp llvm/lib/CodeGen/TargetLoweringBase.cpp llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/include/llvm/CodeGen/TargetLowering.h b/llvm/include/llvm/CodeGen/TargetLowering.h
index a4dc097446..ce5310caf8 100644
--- a/llvm/include/llvm/CodeGen/TargetLowering.h
+++ b/llvm/include/llvm/CodeGen/TargetLowering.h
@@ -1457,7 +1457,8 @@ public:
   /// Same as getLoadExtAction, but for atomic loads.
   LegalizeAction getAtomicLoadExtAction(unsigned ExtType, EVT ValVT,
                                         EVT MemVT) const {
-    if (ValVT.isExtended() || MemVT.isExtended()) return Expand;
+    if (ValVT.isExtended() || MemVT.isExtended())
+      return Expand;
     unsigned ValI = (unsigned)ValVT.getSimpleVT().SimpleTy;
     unsigned MemI = (unsigned)MemVT.getSimpleVT().SimpleTy;
     assert(ExtType < ISD::LAST_LOADEXT_TYPE && ValI < MVT::VALUETYPE_SIZE &&
diff --git a/llvm/lib/Target/SystemZ/SystemZISelLowering.cpp b/llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
index 6496fe7661..d35a9162e5 100644
--- a/llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
+++ b/llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
@@ -299,8 +299,8 @@ SystemZTargetLowering::SystemZTargetLowering(const TargetMachine &TM,
                          {MVT::i8, MVT::i16, MVT::i32}, Legal);
   setAtomicLoadExtAction({ISD::SEXTLOAD, ISD::ZEXTLOAD}, MVT::i32,
                          {MVT::i8, MVT::i16}, Legal);
-  setAtomicLoadExtAction({ISD::SEXTLOAD, ISD::ZEXTLOAD}, MVT::i16,
-                         MVT::i8, Legal);
+  setAtomicLoadExtAction({ISD::SEXTLOAD, ISD::ZEXTLOAD}, MVT::i16, MVT::i8,
+                         Legal);
 
   // We can use the CC result of compare-and-swap to implement
   // the "success" result of ATOMIC_CMP_SWAP_WITH_SUCCESS.

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https://github.com/llvm/llvm-project/pull/86484