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>