Don't expect existing varinfo for arguments in intra_create_variable_infos

2015-10-31  Tom de Vries  <tom@codesourcery.com>

	* tree-ssa-structalias.c (intra_create_variable_infos): Don't expect
	existing varinfo for arguments.

From-SVN: r229620

gcc/ChangeLog

 2015-10-31  Tom de Vries  <tom@codesourcery.com>
 
+	* tree-ssa-structalias.c (intra_create_variable_infos): Don't expect
+	existing varinfo for arguments.
+
+2015-10-31  Tom de Vries  <tom@codesourcery.com>
+
 	* tree-ssa-structalias.c (ipa_pta_execute): Add extra arg to call to
 	create_function_info_for.  Dump constraints generated during
 	create_function_info_for. Move intra_create_variable_infos call and

gcc/tree-ssa-structalias.c

@@ -5912,12 +5912,8 @@ intra_create_variable_infos (struct function *fn)
       bool recursive_restrict_p
 	= (restrict_pointer_p
 	   && !type_contains_placeholder_p (TREE_TYPE (TREE_TYPE (t))));
-      varinfo_t p = lookup_vi_for_tree (t);
-      if (p == NULL)
-	{
-	  p = create_variable_info_for_1 (t, alias_get_name (t), false);
-	  insert_vi_for_tree (t, p);
-	}
+      varinfo_t p = create_variable_info_for_1 (t, alias_get_name (t), false);
+      insert_vi_for_tree (t, p);
 
       /* For restrict qualified pointers build a representative for
 	 the pointed-to object.  Note that this ends up handling