[llvm] Revert "[RegAlloc] Relax the split constrain on MBB prolog" (PR #169990)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions h,cpp -- llvm/lib/CodeGen/RegAllocGreedy.cpp llvm/lib/CodeGen/SplitKit.cpp llvm/lib/CodeGen/SplitKit.h --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/CodeGen/SplitKit.h b/llvm/lib/CodeGen/SplitKit.h
index de2559112..15b0f0515 100644
--- a/llvm/lib/CodeGen/SplitKit.h
+++ b/llvm/lib/CodeGen/SplitKit.h
@@ -88,7 +88,6 @@ public:
     }
     return Res;
   }
-
 };
 
 /// SplitAnalysis - Analyze a LiveInterval, looking for live range splitting

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https://github.com/llvm/llvm-project/pull/169990