[GOOGLE] Updates SSA after VPT transofrmations in AFDO pass

[Dehao Chen]

This patch updates SSA after VPT transformation. This is needed
because compute_inline_parameters will ICE without updated SSA.

Testing on-going.

OK for google-4_8?

Thanks,
Dehao

Index: gcc/auto-profile.c
===================================================================
--- gcc/auto-profile.c (revision 209059)
+++ gcc/auto-profile.c (working copy)
@@ -1448,6 +1448,7 @@ afdo_vpt_for_early_inline (stmt_set *promoted_stmt
       free_dominance_info (CDI_POST_DOMINATORS);
       calculate_dominance_info (CDI_POST_DOMINATORS);
       calculate_dominance_info (CDI_DOMINATORS);
+      update_ssa (TODO_update_ssa);
       rebuild_cgraph_edges ();
       return true;
     }