re PR rtl-optimization/78120 (If conversion no longer performed)

re PR rtl-optimization/78120 (If conversion no longer performed)

	PR rtl-optimization/78120
	* ifcvt.c (noce_conversion_profitable_p): Check original cost in all
	cases, and additionally test against max_seq_cost for speed
	optimization.
	(noce_process_if_block): Compute an estimate for the original cost when
	optimizing for speed, using the minimum of then and else block costs.

testsuite/
	PR rtl-optimization/78120
	* gcc.target/i386/pr78120.c: New test.

From-SVN: r242834