combine.c (label_tick_ebb_start): Fix comment.

combine.c (label_tick_ebb_start): Fix comment.

	* combine.c (label_tick_ebb_start): Fix comment.
	(combine_instructions): Set label_tick and label_tick_ebb_start before
	calling setup_incoming_promotions.  Start them from 1.  Increment
	label_tick instead of deriving it from the BB index.  Rather than
	comparing ticks use the block from the previous iteration to decide
	whether to start a new EBB.  Remove empty lines before function.

testsuite/
	* gcc.target/mips/truncate-6.c: New test.

From-SVN: r152567