Fix PHI IDs in LTO streaming

[Jan Hubicka]

Hi,
LTO streaming renumbers gimple statements. It however forgets about PHIs that causes
duplicated gimple ids and later fun everywhere (especially for me when I want to
use them for reference streaming).
This patch assign numbers to SSA names too.  Since virtual PHIs are not stored, we
have to ignore them on stream-out time.  I do not think it is cool that they get
duplicated ids so I just renumber them afterwards.

Bootstrapped/regtested x86_64-linux, comitted as obvious.

Honza

	* lto-streamer-out.c (output_function): Renumber PHIs.
	* lto-streamer-in.c (input_function): Likewise.
Index: lto-streamer-out.c
===================================================================
--- lto-streamer-out.c	(revision 201568)
+++ lto-streamer-out.c	(working copy)
@@ -1792,12 +1792,32 @@ output_function (struct cgraph_node *nod
       FOR_ALL_BB (bb)
 	{
 	  gimple_stmt_iterator gsi;
+	  for (gsi = gsi_start_phis (bb); !gsi_end_p (gsi); gsi_next (&gsi))
+	    {
+	      gimple stmt = gsi_stmt (gsi);
+
+	      /* Virtual PHIs are not going to be streamed.  */
+	      if (!virtual_operand_p (gimple_phi_result (stmt)))
+	        gimple_set_uid (stmt, inc_gimple_stmt_max_uid (cfun));
+	    }
 	  for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
 	    {
 	      gimple stmt = gsi_stmt (gsi);
 	      gimple_set_uid (stmt, inc_gimple_stmt_max_uid (cfun));
 	    }
 	}
+      /* To avoid keeping duplicate gimple IDs in the statements, renumber
+	 virtual phis now.  */
+      FOR_ALL_BB (bb)
+	{
+	  gimple_stmt_iterator gsi;
+	  for (gsi = gsi_start_phis (bb); !gsi_end_p (gsi); gsi_next (&gsi))
+	    {
+	      gimple stmt = gsi_stmt (gsi);
+	      if (virtual_operand_p (gimple_phi_result (stmt)))
+	        gimple_set_uid (stmt, inc_gimple_stmt_max_uid (cfun));
+	    }
+	}
 
       /* Output the code for the function.  */
       FOR_ALL_BB_FN (bb, fn)
Index: lto-streamer-in.c
===================================================================
--- lto-streamer-in.c	(revision 201568)
+++ lto-streamer-in.c	(working copy)
@@ -908,6 +908,11 @@ input_function (tree fn_decl, struct dat
   FOR_ALL_BB (bb)
     {
       gimple_stmt_iterator gsi;
+      for (gsi = gsi_start_phis (bb); !gsi_end_p (gsi); gsi_next (&gsi))
+	{
+	  gimple stmt = gsi_stmt (gsi);
+	  gimple_set_uid (stmt, inc_gimple_stmt_max_uid (cfun));
+	}
       for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
 	{
 	  gimple stmt = gsi_stmt (gsi);
@@ -917,7 +922,14 @@ input_function (tree fn_decl, struct dat
   stmts = (gimple *) xcalloc (gimple_stmt_max_uid (fn), sizeof (gimple));
   FOR_ALL_BB (bb)
     {
-      gimple_stmt_iterator bsi = gsi_start_bb (bb);
+      gimple_stmt_iterator bsi = gsi_start_phis (bb);
+      while (!gsi_end_p (bsi))
+	{
+	  gimple stmt = gsi_stmt (bsi);
+	  gsi_next (&bsi);
+	  stmts[gimple_uid (stmt)] = stmt;
+	}
+      bsi = gsi_start_bb (bb);
       while (!gsi_end_p (bsi))
 	{
 	  gimple stmt = gsi_stmt (bsi);