re PR tree-optimization/60280 (gcc.target/arm/ivopts.c and gcc.target/arm/ivopts-2.c failed caused by preserving loop structure.)

2014-02-28  Richard Biener  <rguenther@suse.de>

	PR target/60280
	* tree-cfgcleanup.c (tree_forwarder_block_p): Restrict
	previous fix and only allow to remove trivial pre-headers
	and latches.  Also honor LOOPS_MAY_HAVE_MULTIPLE_LATCHES.
	(remove_forwarder_block): Properly update the latch of
	a loop.

From-SVN: r208222