* dbgcnt.def (prefetch): New debug counter.
	* tree-ssa-loop-prefetch.c (dbgcnt.h): New include.
	(schedule_prefetches): Stop issueing prefetches if debug counter
	tripped.

Change-Id: Ia6160364735a889fb6d2370be21d98f87c0fe962

From-SVN: r248924