[clang] [clang] Avoid assertion on invalid member template specialization (PR #201506)

[Fan Mo via cfe-commits]

================
@@ -2247,9 +2247,10 @@ DeclResult Sema::CheckClassTemplate(
     NewTemplate->setModulePrivate();
 
   if (IsMemberSpecialization) {
-    assert(PrevClassTemplate &&
+    assert((PrevClassTemplate || Invalid) &&
            "Member specialization without a primary template?");
-    NewTemplate->setMemberSpecialization();
+    if (PrevClassTemplate)
+      NewTemplate->setMemberSpecialization();
----------------
w007878 wrote:

sure, I'll take your suggestion. thank you

https://github.com/llvm/llvm-project/pull/201506
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