fixup! stricter test assertion

Author: Michael137

lldb/unittests/SymbolFile/DWARF/DWARFASTParserClangTests.cpp

@@ -1969,7 +1969,7 @@ TEST_F(DWARFASTParserClangTests, TestTemplateAlias_NoSimpleTemplateNames) {
   DWARFDIE cu_die = tester.GetCUDIE();
 
   auto alias_die = cu_die.GetFirstChild().GetSibling();
-  ASSERT_TRUE(alias_die.IsValid());
+  ASSERT_EQ(alias_die.Tag(), DW_TAG_template_alias);
 
   SymbolContext sc;
   auto type_sp =