[CodeGen] Remove unused variable 'ID' (NFC)

DamonFool · DamonFool · commit 6e43cdbc25e9 · 2025-04-30T19:15:27.000+08:00
/llvm-project/llvm/lib/CodeGen/VirtRegMap.cpp:225:15:
error: unused variable 'ID' [-Werror,-Wunused-variable]
  static char ID;
              ^
1 error generated.
diff --git a/llvm/lib/CodeGen/VirtRegMap.cpp b/llvm/lib/CodeGen/VirtRegMap.cpp
@@ -222,7 +222,6 @@ class VirtRegRewriter {
       MCRegister PhysReg, const MachineInstr &MI) const;
 
 public:
-  static char ID;
   VirtRegRewriter(bool ClearVirtRegs, SlotIndexes *Indexes, LiveIntervals *LIS,
                   LiveRegMatrix *LRM, VirtRegMap *VRM,
                   LiveDebugVariables *DebugVars)
