mn10300: Use the STC bb-reorder algorithm at -Os

For mn10300, STC still gives better results for optimise-for-size than
"simple" does.  So use STC at -Os as well.


2015-10-19  Segher Boessenkool  <segher@kernel.crashing.org>

	* common/config/mn10300/mn10300-common.c
	(mn10300_option_optimization_table) <OPT_freorder_blocks_algorithm_>:
	Use REORDER_BLOCKS_ALGORITHM_STC at -Os and up.

From-SVN: r229006

gcc/ChangeLog

+2015-10-19  Segher Boessenkool  <segher@kernel.crashing.org>
+
+	* common/config/mn10300/mn10300-common.c
+	(mn10300_option_optimization_table) <OPT_freorder_blocks_algorithm_>:
+	Use REORDER_BLOCKS_ALGORITHM_STC at -Os and up.
+
 2015-10-19  David Wohlferd  <dw@LimeGreenSocks.com>
 
 	* doc/extend.texi (Explicit Register Variables): Simplify and

gcc/common/config/mn10300/mn10300-common.c

@@ -30,6 +30,9 @@
 static const struct default_options mn10300_option_optimization_table[] =
   {
     { OPT_LEVELS_1_PLUS, OPT_fomit_frame_pointer, NULL, 1 },
+    /* The STC algorithm produces the smallest code at -Os.  */
+    { OPT_LEVELS_2_PLUS, OPT_freorder_blocks_algorithm_, NULL,
+      REORDER_BLOCKS_ALGORITHM_STC },
     { OPT_LEVELS_NONE, 0, NULL, 0 }
   };