[NDS32] Consider -Ofast and -Og in nds32_asm_file_start function.

gcc/
	* config/nds32/nds32.c (nds32_asm_file_start): Display optimization
	level Ofast and Og.

From-SVN: r259546

gcc/ChangeLog

+2018-04-22  Chung-Ju Wu  <jasonwucj@gmail.com>
+
+	* config/nds32/nds32.c (nds32_asm_file_start): Display optimization
+	level Ofast and Og.
+
 2018-04-22  Monk Chiang  <sh.chiang04@gmail.com>
 	    Chung-Ju Wu  <jasonwucj@gmail.com>
 

gcc/config/nds32/nds32.c

@@ -2893,6 +2893,10 @@ nds32_asm_file_start (void)
 
   if (optimize_size)
     fprintf (asm_out_file, "\t! Optimization level\t: -Os\n");
+  else if (optimize_fast)
+    fprintf (asm_out_file, "\t! Optimization level\t: -Ofast\n");
+  else if (optimize_debug)
+    fprintf (asm_out_file, "\t! Optimization level\t: -Og\n");
   else
     fprintf (asm_out_file, "\t! Optimization level\t: -O%d\n", optimize);