[FOLD] add tests

Author: sdkrystian

clang/test/ASTMerge/class-template-spec/Inputs/class-template-spec.cpp

@@ -0,0 +1,47 @@
+namespace N0 {
+  template<typename T>
+  struct A {
+    template<typename U>
+    friend struct A;
+  };
+
+  template struct A<long>;
+} // namespace N0
+
+namespace N1 {
+  template<typename T>
+  struct A;
+
+  template<typename T>
+  struct A {
+    template<typename U>
+    friend struct A;
+  };
+
+  template struct A<long>;
+} // namespace N1
+
+namespace N2 {
+  template<typename T>
+  struct A {
+    template<typename U>
+    friend struct A;
+  };
+
+  template<typename T>
+  struct A;
+
+  template struct A<long>;
+} // namespace N2
+
+namespace N3 {
+  struct A {
+    template<typename T>
+    friend struct B;
+  };
+
+  template<typename T>
+  struct B { };
+
+  template struct B<long>;
+} // namespace N3

clang/test/ASTMerge/class-template-spec/test.cpp

@@ -0,0 +1,8 @@
+// RUN: %clang_cc1 -emit-pch -o %t.1.ast %S/Inputs/class-template-spec.cpp
+// RUN: %clang_cc1 -ast-merge %t.1.ast -fsyntax-only -verify %s
+// expected-no-diagnostics
+
+template struct N0::A<short>;
+template struct N1::A<short>;
+template struct N2::A<short>;
+template struct N3::B<short>;