[llvm] [CodeGen] Ignore requiresStructuredCFG check in canSplitCriticalEdge if successor is loop header (PR #154063)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- llvm/include/llvm/CodeGen/MachineBasicBlock.h llvm/lib/CodeGen/MachineBasicBlock.cpp
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/CodeGen/MachineBasicBlock.cpp b/llvm/lib/CodeGen/MachineBasicBlock.cpp
index dfcc31226..f67b3c0dc 100644
--- a/llvm/lib/CodeGen/MachineBasicBlock.cpp
+++ b/llvm/lib/CodeGen/MachineBasicBlock.cpp
@@ -1408,8 +1408,8 @@ bool MachineBasicBlock::canSplitCriticalEdge(const MachineBasicBlock *Succ,
     // If `Succ` is a loop header, splitting the critical edge will not
     // break structured CFG.
     if (MLI) {
-       const MachineLoop *L = MLI->getLoopFor(Succ);
-       return L && L->getHeader() == Succ;
+      const MachineLoop *L = MLI->getLoopFor(Succ);
+      return L && L->getHeader() == Succ;
     }
 
     return false;

``````````

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https://github.com/llvm/llvm-project/pull/154063