[DebugInfo][NFC] Remove `FuncArgumentDbgValueKind::Addr` from SelectionDAG

[jryans]

Summary

This removes the unused FuncArgumentDbgValueKind::Addr value originally added
by e24f5348798605a799c63ff09169d177d262cd37. The intent was to signal the
original intrinsic that marked a function argument, but the Addr part was
never used.

Part of dbg.addr removal
Discussed in https://discourse.llvm.org/t/what-is-the-status-of-dbg-addr/62898

Depends on D144793

llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h

private:
 
   void emitInlineAsmError(const CallBase &Call, const Twine &Message);
 
   /// An enum that states to emit func argument dbg value the kind of intrinsic
   /// it originally had. This controls the internal behavior of
   /// EmitFuncArgumentDbgValue.
   enum class FuncArgumentDbgValueKind {
     Value,   // This was originally a llvm.dbg.value.
-    Addr,    // This was originally a llvm.dbg.addr.
     Declare, // This was originally a llvm.dbg.declare.
   };
 
   /// If V is an function argument then create corresponding DBG_VALUE machine
   /// instruction for it now. At the end of instruction selection, they will be
   /// inserted to the entry BB.
   bool EmitFuncArgumentDbgValue(const Value *V, DILocalVariable *Variable,
                                 DIExpression *Expr, DILocation *DL,