[llvm] [SelectionDAG] Improve isGuaranteedNotToBeUndefOrPoison (PR #147019)

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


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``````````bash
git-clang-format --diff HEAD~1 HEAD --extensions h,cpp -- llvm/include/llvm/CodeGen/SelectionDAGNodes.h llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
``````````

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<details>
<summary>
View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index 107014465..5f7eb7b66 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -5529,9 +5529,8 @@ bool SelectionDAG::isGuaranteedNotToBeUndefOrPoison(SDValue Op,
     if (DemandedElts.ugt(1) && !PoisonOnly)
       return false;
     // Check element zero.
-    if (DemandedElts[0] && !isGuaranteedNotToBeUndefOrPoison(Op.getOperand(0),
-                                                             PoisonOnly,
-                                                             Depth + 1))
+    if (DemandedElts[0] && !isGuaranteedNotToBeUndefOrPoison(
+                               Op.getOperand(0), PoisonOnly, Depth + 1))
       return false;
     return true;
 
@@ -5564,8 +5563,8 @@ bool SelectionDAG::isGuaranteedNotToBeUndefOrPoison(SDValue Op,
     // enough to check operand 0 if Op can't create undef/poison.
     return !canCreateUndefOrPoison(Op, DemandedElts, PoisonOnly,
                                    /*ConsiderFlags*/ true, Depth) &&
-        isGuaranteedNotToBeUndefOrPoison(Op.getOperand(0), DemandedElts,
-                                         PoisonOnly, Depth + 1);
+           isGuaranteedNotToBeUndefOrPoison(Op.getOperand(0), DemandedElts,
+                                            PoisonOnly, Depth + 1);
 
   case ISD::BSWAP:
   case ISD::CTPOP:
@@ -5598,9 +5597,9 @@ bool SelectionDAG::isGuaranteedNotToBeUndefOrPoison(SDValue Op,
     return !canCreateUndefOrPoison(Op, DemandedElts, PoisonOnly,
                                    /*ConsiderFlags*/ true, Depth) &&
            all_of(Op->ops(), [&](SDValue V) {
-               return isGuaranteedNotToBeUndefOrPoison(V, DemandedElts,
-                                                       PoisonOnly, Depth + 1);
-             });
+             return isGuaranteedNotToBeUndefOrPoison(V, DemandedElts,
+                                                     PoisonOnly, Depth + 1);
+           });
   }
 
     // TODO: Search for noundef attributes from library functions.

``````````

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https://github.com/llvm/llvm-project/pull/147019