arc: Don't use if-conversion when optimizing for size.

For ARC, predicated instructions are not very friendly with size
optimizations, leading to increased object size. Disable if-conversion
step when optimized for size.

gcc/
xxxx-xx-xx  Claudiu Zissulescu  <claziss@synopsys.com>

	* common/config/arc/arc-common.c (arc_option_optimization_table):
	Disable if-conversion step when optimized for size.

Signed-off-by: Claudiu Zissulescu <claziss@gmail.com>

gcc/ChangeLog

 2020-02-13  Claudiu Zissulescu  <claziss@synopsys.com>
 
+	* common/config/arc/arc-common.c (arc_option_optimization_table):
+	Disable if-conversion step when optimized for size.
+
+2020-02-13  Claudiu Zissulescu  <claziss@synopsys.com>
+
 	* config/arc/arc.c (arc_conditional_register_usage): R0-R3 and
 	R12-R15 are always in ARCOMPACT16_REGS register class.
 	* config/arc/arc.opt (mq-class): Deprecate.

gcc/common/config/arc/arc-common.c

@@ -59,6 +59,7 @@ static const struct default_options arc_option_optimization_table[] =
     { OPT_LEVELS_SIZE, OPT_mcase_vector_pcrel, NULL, 1 },
     { OPT_LEVELS_SIZE, OPT_msize_level_, NULL, 3 },
     { OPT_LEVELS_SIZE, OPT_mmillicode, NULL, 1 },
+    { OPT_LEVELS_SIZE, OPT_fif_conversion, NULL, 0 },
     { OPT_LEVELS_1_PLUS, OPT_fomit_frame_pointer, NULL, 1 },
     { OPT_LEVELS_3_PLUS_SPEED_ONLY, OPT_msize_level_, NULL, 0 },
     { OPT_LEVELS_3_PLUS_SPEED_ONLY, OPT_malign_call, NULL, 1 },