Fix recrusive inlining into thunks

[Jan Hubicka]

Hi,
this patch fixes ICE when thunk is inlined and call within thunk too. We need
to recurse in this case because inlining thunk does not introduce a new basic 
blocks
like normal inlining does.

Bootstrapped/regtested x86_64-linux, comitted.

Honza

Index: ChangeLog
===================================================================
--- ChangeLog   (revision 236272)
+++ ChangeLog   (working copy)
@@ -1,5 +1,9 @@
 2016-05-16  Jan Hubicka  <hubi...@ucw.cz>
 
+       * tree-inline.c (expand_call_inline): recurse after inlining thunk.
+
+2016-05-16  Jan Hubicka  <hubi...@ucw.cz>
+
        * tree.c (free_lang_data_in_decl): Also set target/optimization flags
        for thunks.
 
Index: tree-inline.c
===================================================================
--- tree-inline.c       (revision 236269)
+++ tree-inline.c       (working copy)
@@ -4485,6 +4485,7 @@ expand_call_inline (basic_block bb, gimp
       gimple_call_set_fndecl (stmt, edge->callee->decl);
       update_stmt (stmt);
       id->src_node->remove ();
+      expand_call_inline (bb, stmt, id);
       return true;
     }
   fn = cg_edge->callee->decl;