[GOOGLE] get resolved node in walk_polymorphic_call_targets

[Dehao Chen]

This patch fixes LIPO ICE that an unresolved node escaped after lipo fixup.

testing on going. OK for google-4_9?

Thanks,
Dehao

Index: gcc/ipa.c
===================================================================
--- gcc/ipa.c (revision 210864)
+++ gcc/ipa.c (working copy)
@@ -39,6 +39,7 @@ along with GCC; see the file COPYING3.  If not see
 #include "tree-inline.h"
 #include "profile.h"
 #include "params.h"
+#include "l-ipo.h"

 /* Return true when NODE can not be local. Worker for cgraph_local_node_p.  */

@@ -195,6 +196,9 @@ walk_polymorphic_call_targets (pointer_set_t *reac
  {
    struct cgraph_node *n = targets[i];

+   if (L_IPO_COMP_MODE && cgraph_pre_profiling_inlining_done)
+     n = cgraph_lipo_get_resolved_node (n->decl);
+
    /* Do not bother to mark virtual methods in anonymous namespace;
      either we will find use of virtual table defining it, or it is
      unused.  */