[Targets] Remove unused ID in *DAGToDAGISel (#94135)

Author: paperchalice

llvm/lib/Target/AVR/AVRISelDAGToDAG.cpp

@@ -29,8 +29,6 @@ namespace {
 /// Lowers LLVM IR (in DAG form) to AVR MC instructions (in DAG form).
 class AVRDAGToDAGISel : public SelectionDAGISel {
 public:
-  static char ID;
-
   AVRDAGToDAGISel() = delete;
 
   AVRDAGToDAGISel(AVRTargetMachine &TM, CodeGenOptLevel OptLevel)

llvm/lib/Target/Lanai/LanaiISelDAGToDAG.cpp

@@ -48,8 +48,6 @@ namespace {
 
 class LanaiDAGToDAGISel : public SelectionDAGISel {
 public:
-  static char ID;
-
   LanaiDAGToDAGISel() = delete;
 
   explicit LanaiDAGToDAGISel(LanaiTargetMachine &TargetMachine)

llvm/lib/Target/LoongArch/LoongArchISelDAGToDAG.h

@@ -24,8 +24,6 @@ class LoongArchDAGToDAGISel : public SelectionDAGISel {
   const LoongArchSubtarget *Subtarget = nullptr;
 
 public:
-  static char ID;
-
   LoongArchDAGToDAGISel() = delete;
 
   explicit LoongArchDAGToDAGISel(LoongArchTargetMachine &TM)