Initial tests for verifying forward declarations

(cherry picked from commit c9b5a07d5cd83100862e067ccff189e10c666f9b)

test/Autoloading/Def.h

@@ -0,0 +1,21 @@
+int id(int x) {
+  return x;
+}
+
+class C {
+  //irrelevant
+};
+
+namespace N {
+  void nested() {
+  }
+}//end namespace N
+
+template<typename T> class Gen {
+};
+
+template<> class Gen<int> {
+};
+
+template<typename T,typename U> class Partial {
+};

test/Autoloading/Forwarding.C

@@ -0,0 +1,33 @@
+//------------------------------------------------------------------------------
+// CLING - the C++ LLVM-based InterpreterG :)
+//
+// This file is dual-licensed: you can choose to license it under the University
+// of Illinois Open Source License or the GNU Lesser General Public License. See
+// LICENSE.TXT for details.
+//------------------------------------------------------------------------------
+
+// RUN: cat %s | %cling -I %S -Xclang -verify
+// Test forwardDeclaration
+.rawInput 1
+int id(int) __attribute__((annotate("Def.h")));
+
+class __attribute__((annotate("Def.h"))) C;
+
+namespace N {
+  void nested() __attribute__((annotate("Def.h")));
+}
+
+template <typename T> class __attribute__((annotate("Def.h"))) Gen;
+template <> class __attribute__((annotate("Def.h"))) Gen<int> ;
+template <> class __attribute__((annotate("Spc.h"))) Gen<float>;
+
+template <typename T,typename U> class  __attribute__((annotate("Def.h"))) Partial;
+template <typename T> class __attribute__((annotate("Spc.h"))) Partial<T,int>;
+
+
+.rawInput 0
+
+#include "Def.h"
+#include "Spc.h"
+//expected-no-diagnostics
+.q

test/Autoloading/Spc.h

@@ -0,0 +1,5 @@
+template<> class Gen<float> {
+};
+
+template<typename T> class Partial<T,int> {
+};