[FOLD] more cleanups

Author: sdkrystian

clang/include/clang/AST/DeclTemplate.h

@@ -863,6 +863,7 @@ class RedeclarableTemplateDecl : public TemplateDecl,
 
   /// Note that this member template is a specialization.
   void setMemberSpecialization() {
+    assert(!isMemberSpecialization() && "already a member specialization");
     Common.setInt(true);
   }
 

clang/lib/Sema/SemaDecl.cpp

@@ -12005,8 +12005,6 @@ bool Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD,
       // If this is an explicit specialization of a member that is a function
       // template, mark it as a member specialization.
       if (IsMemberSpecialization) {
-        NewTemplateDecl->setMemberSpecialization();
-        // assert(OldTemplateDecl->isMemberSpecialization());
         // Explicit specializations of a member template do not inherit deleted
         // status from the parent member template that they are specializing.
         if (OldFD->isDeleted()) {

clang/lib/Sema/SemaTemplateInstantiateDecl.cpp

@@ -4693,20 +4693,6 @@ bool Sema::InstantiateDefaultArgument(SourceLocation CallLoc, FunctionDecl *FD,
       Innermost = FD->getTemplateSpecializationArgs()->asArray();
     }
   }
-  #if 0
-
-    Pattern = FTD->isCXXClassMember() ? FTD->getFirstDecl() : FTD;
-  } else if (FD->isCXXClassMember()) {
-    Pattern = FD->getFirstDecl();
-  } else {
-    Pattern = FD;
-  }
-  #elif 0
-  Pattern = FD;
-  #elif 0
-  Pattern = FD->getTemplateInstantiationPattern(/*ForDefinition=*/true);
-  #elif 1
-  #endif
 
   // Instantiate the expression.
   //