[clang] [clang] Don't lose track of explicit specializations of member functi… (PR #111267)

[Younan Zhang via cfe-commits]

================
@@ -4206,18 +4206,14 @@ Sema::InstantiateClassMembers(SourceLocation PointOfInstantiation,
         if (Function->hasAttr<ExcludeFromExplicitInstantiationAttr>())
           continue;
 
-        MemberSpecializationInfo *MSInfo =
-            Function->getMemberSpecializationInfo();
-        assert(MSInfo && "No member specialization information?");
-        if (MSInfo->getTemplateSpecializationKind()
-                                                 == TSK_ExplicitSpecialization)
+        TemplateSpecializationKind PrevTSK =
+            Function->getTemplateSpecializationKind();
+        if (PrevTSK == TSK_ExplicitSpecialization)
           continue;
----------------
zyn0217 wrote:

IIUC the new behavior handles `DependentFunctionTemplateSpecializationInfo` as well, right?

https://github.com/llvm/llvm-project/pull/111267