[Sema] Remove some conditions of a failing assert

We should have been checking that this state is consistent, but its
possible for it to be filled later, so it isn't really sound to check
it here anyways.

Fixes llvm.org/PR39742

llvm-svn: 348325

clang/lib/AST/DeclTemplate.cpp

@@ -329,8 +329,6 @@ void FunctionTemplateDecl::mergePrevDecl(FunctionTemplateDecl *Prev) {
 
   // Ensure we don't leak any important state.
   assert(ThisCommon->Specializations.size() == 0 &&
-         !ThisCommon->InstantiatedFromMember.getPointer() &&
-         !ThisCommon->InstantiatedFromMember.getInt() &&
          "Can't merge incompatible declarations!");
 
   Base::Common = PrevCommon;

clang/test/SemaCXX/friend-template-redecl.cpp

@@ -18,3 +18,14 @@ void f() {
   foo(x);
   bar(x);
 }
+
+namespace PR39742 {
+template<typename>
+struct wrapper {
+  template<typename>
+  friend void friend_function_template() {}
+};
+
+wrapper<bool> x;
+wrapper<int> y;
+}