re PR ipa/60243 (IPA is slow on large cgraph tree)

	PR ipa/60243
	* tree-inline.c (estimate_num_insns): Set to 1 at least.

From-SVN: r254934

gcc/ChangeLog

 2017-11-19  Jan Hubicka  <hubicka@ucw.cz>
 
+	PR ipa/60243
+	* tree-inline.c (estimate_num_insns): Set to 1 at least.
+
+2017-11-19  Jan Hubicka  <hubicka@ucw.cz>
+
 	PR target/82713
 	* i386.c (ix86_builtin_vectorization_cost): Be ready for insane
 	types.

gcc/tree-inline.c

@@ -4100,7 +4100,7 @@ estimate_num_insns (gimple *stmt, eni_weights *weights)
 	   with very long asm statements.  */
 	if (count > 1000)
 	  count = 1000;
-	return count;
+	return MAX (1, count);
       }
 
     case GIMPLE_RESX: