[lldb] Use correct size when dumping DWARF64 DW_FORM_ref_addr (llvm#146686)

Not that we ever do that, because this is unused code, but if someone
was debugging lldb I guess they'd call this.

Was missed in llvm#145645

Relates to llvm#135208

Author: DavidSpickett

lldb/source/Plugins/SymbolFile/DWARF/DWARFFormValue.cpp

@@ -412,12 +412,8 @@ void DWARFFormValue::Dump(Stream &s) const {
   case DW_FORM_ref_addr: {
     assert(m_unit); // Unit must be valid for DW_FORM_ref_addr objects or we
                     // will get this wrong
-    if (m_unit->GetVersion() <= 2)
-      DumpAddress(s.AsRawOstream(), uvalue, sizeof(uint64_t) * 2);
-    else
-      DumpAddress(s.AsRawOstream(), uvalue,
-                  4 * 2); // 4 for DWARF32, 8 for DWARF64, but we don't
-                          // support DWARF64 yet
+    DumpAddress(s.AsRawOstream(), uvalue,
+                m_unit->GetFormParams().getRefAddrByteSize());
     break;
   }
   case DW_FORM_ref1: