Fix ICE while inlining thunks

[Jan Hubicka]

Hi,
when inlining thunks we incorrectly update edge caches of callees. This is 
because
bogus function_symbol call. edge->callee is the inline function body and that 
is never
alias.

Bootstrapped/regtste x86_64-linux, will commit it tomorrow.

        * ipa-inline.c (report_inline_failed_reason): Look into thunks, too
        (inline_small_functions): Do not look for function symbol when resetting
        caches.

Index: ipa-inline.c
===================================================================
--- ipa-inline.c        (revision 236211)
+++ ipa-inline.c        (working copy)
@@ -233,11 +233,11 @@ report_inline_failed_reason (struct cgra
       if ((e->inline_failed == CIF_TARGET_OPTION_MISMATCH
           || e->inline_failed == CIF_OPTIMIZATION_MISMATCH)
          && e->caller->lto_file_data
-         && e->callee->function_symbol ()->lto_file_data)
+         && e->callee->ultimate_alias_target ()->lto_file_data)
        {
          fprintf (dump_file, "  LTO objects: %s, %s\n",
                   e->caller->lto_file_data->file_name,
-                  e->callee->function_symbol ()->lto_file_data->file_name);
+                  e->callee->ultimate_alias_target 
()->lto_file_data->file_name);
        }
       if (e->inline_failed == CIF_TARGET_OPTION_MISMATCH)
        cl_target_option_print_diff
@@ -2027,7 +2027,7 @@ inline_small_functions (void)
          inline_call (edge, true, &new_indirect_edges, &overall_size, true);
          add_new_edges_to_heap (&edge_heap, new_indirect_edges);
 
-         reset_edge_caches (edge->callee->function_symbol ());
+         reset_edge_caches (edge->callee);
 
          update_callee_keys (&edge_heap, where, updated_nodes);
        }