[llvm] Negative frame indicies as register. (PR #164459)

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git-clang-format --diff origin/main HEAD --extensions cpp,h -- llvm/include/llvm/CodeGen/Register.h llvm/lib/CodeGen/ReachingDefAnalysis.cpp --diff_from_common_commit
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``````````diff
diff --git a/llvm/include/llvm/CodeGen/Register.h b/llvm/include/llvm/CodeGen/Register.h
index 961d6fe74..9aa30e9f3 100644
--- a/llvm/include/llvm/CodeGen/Register.h
+++ b/llvm/include/llvm/CodeGen/Register.h
@@ -38,7 +38,8 @@ public:
                 "Reg isn't large enough to hold full range.");
   static constexpr unsigned MaxFrameIndexBitwidth = 30;
   static constexpr unsigned FirstStackSlot = 1u << MaxFrameIndexBitwidth;
-  static const unsigned StackSlotMask = (unsigned)(-1) >> (CHAR_BIT * sizeof(unsigned) - MaxFrameIndexBitwidth);
+  static const unsigned StackSlotMask =
+      (unsigned)(-1) >> (CHAR_BIT * sizeof(unsigned) - MaxFrameIndexBitwidth);
   static_assert(FirstStackSlot >= MCRegister::LastPhysicalReg);
   static constexpr unsigned VirtualRegFlag = 1u << 31;
 

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https://github.com/llvm/llvm-project/pull/164459