profile-count.c (profile_count::combine_with_ipa_count): Handle zeros correctly.

	* profile-count.c (profile_count::combine_with_ipa_count): Handle
	zeros correctly.

From-SVN: r257182

gcc/ChangeLog

+2018-01-30  Jan Hubicka  <hubicka@ucw.cz>
+
+	* profile-count.c (profile_count::combine_with_ipa_count): Handle
+	zeros correctly.
+
 2018-01-30  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/83008

gcc/profile-count.c

@@ -321,7 +321,7 @@ profile_count::combine_with_ipa_count (profile_count ipa)
   ipa = ipa.ipa ();
   if (ipa.nonzero_p ())
     return ipa;
-  if (!ipa.initialized_p ())
+  if (!ipa.initialized_p () || *this == profile_count::zero ())
     return *this;
   if (ipa == profile_count::zero ())
     return this->global0 ();