* tree-ssa-loop-prefetch.c (schedule_prefetches): Cleanup and improve
	comments.
	(issue_prefetch_ref): Move assignment to write_p out of loop.
	(determine_unroll_factor): Do not take PARAM_MAX_UNROLL_TIMES and
	SIMULTANEOUS_PREFETCHES into account.
	(loop_prefetch_arrays): Do not pass ahead to determine_unroll_factor.
	* lambda-code.c (lcm): Renamed to ...
	(least_common_multiple): ... and exported.
	* tree-flow.h (least_common_multiple): Declare.

From-SVN: r118730