[llvm] [DirectX] Resolve unreachable default branches in switch statements (PR #193592)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Target/DirectX/DXILLegalizePass.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Target/DirectX/DXILLegalizePass.cpp b/llvm/lib/Target/DirectX/DXILLegalizePass.cpp
index 432197427..f22da6a27 100644
--- a/llvm/lib/Target/DirectX/DXILLegalizePass.cpp
+++ b/llvm/lib/Target/DirectX/DXILLegalizePass.cpp
@@ -406,9 +406,10 @@ legalizeGetHighLowi64Bytes(Instruction &I,
   return false;
 }
 
-static bool resolveUnreachableSwitchDefault(
-    Instruction &I, SmallVectorImpl<Instruction *> &ToRemove,
-    DenseMap<Value *, Value *> &) {
+static bool
+resolveUnreachableSwitchDefault(Instruction &I,
+                                SmallVectorImpl<Instruction *> &ToRemove,
+                                DenseMap<Value *, Value *> &) {
   auto *SI = dyn_cast<SwitchInst>(&I);
   if (!SI || SI->getNumCases() == 0)
     return false;
@@ -443,8 +444,7 @@ static bool resolveUnreachableSwitchDefault(
   }
 
   BasicBlock *NewDefault =
-      CommonSuccessor ? CommonSuccessor
-                      : SI->case_begin()->getCaseSuccessor();
+      CommonSuccessor ? CommonSuccessor : SI->case_begin()->getCaseSuccessor();
 
   BasicBlock *SwitchBB = SI->getParent();
   SI->setDefaultDest(NewDefault);

``````````

</details>


https://github.com/llvm/llvm-project/pull/193592