[lldb][DWARF] Do not complete type from declaration die. (#91799)

Fix the problem:
https://github.com/llvm/llvm-project/pull/90663#issuecomment-2105164917
by enhancing a double-check for #90663

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

diff --git a/lldb/source/Plugins/SymbolFile/DWARF/DWARFASTParserClang.cpp b/lldb/source/Plugins/SymbolFile/DWARF/DWARFASTParserClang.cpp
index e0b1b43..2a46be9 100644
--- a/lldb/source/Plugins/SymbolFile/DWARF/DWARFASTParserClang.cpp
+++ b/lldb/source/Plugins/SymbolFile/DWARF/DWARFASTParserClang.cpp
@@ -2345,6 +2345,11 @@
 
   if (!die)
     return false;
+  ParsedDWARFTypeAttributes attrs(die);
+  bool is_forward_declaration = IsForwardDeclaration(
+      die, attrs, SymbolFileDWARF::GetLanguage(*die.GetCU()));
+  if (is_forward_declaration)
+    return false;
 
   const dw_tag_t tag = die.Tag();