libgccjit++.h: use indentation to show inheritance

gcc/jit/ChangeLog:
	* libgccjit++.h: Indent the forward declarations of the classes to
	show the inheritance hierarchy.

From-SVN: r218489

gcc/jit/ChangeLog

 2014-12-08  David Malcolm  <dmalcolm@redhat.com>
 
+	* libgccjit++.h: Indent the forward declarations of the classes to
+	show the inheritance hierarchy.
+
+2014-12-08  David Malcolm  <dmalcolm@redhat.com>
+
 	* notes.txt: Show the beginning and ending of
 	recording::context::compile vs playback::context::compile.  Show
 	the creation and unlinking of the tempdir.  Show toplev::finalize.

gcc/jit/libgccjit++.h

@@ -32,16 +32,19 @@ along with GCC; see the file COPYING3.  If not see
 
 namespace gccjit
 {
+  /* Indentation indicates inheritance.  */
   class context;
-  class location;
-  class field;
-  class type;
-  class struct_;
-  class param;
-  class function;
-  class block;
-  class rvalue;
-  class lvalue;
+  class error;
+  class object;
+    class location;
+    class field;
+    class type;
+      class struct_;
+    class function;
+    class block;
+    class rvalue;
+     class lvalue;
+       class param;
 
   /* Errors within the API become C++ exceptions of this class.  */
   class error