loop.c (scan_loop, [...]): Change unroll_p and bct_p parameters to flags.

loop.c (scan_loop, [...]): Change unroll_p and bct_p parameters to flags.

	* loop.c (scan_loop, strength_reduce, loop_optimize): Change unroll_p
	and bct_p parameters to flags.
	* loop.h (LOOP_UNROLL, LOOP_BCT): New constants.
	* rtl.h (loop_optimize): Update prototype.
	* toplev.c (rest_of_compilation): Update call of loop_optimize.

From-SVN: r33912