* haifa-sched.c (compute_trg_info): Add explanatory comments.
	New local update_blocks.  Use update_blocks to remove duplicates
	when computing update blocks.  Check for bblst_table overflow.
	(schedule_block): Add explanatory comment.  Reduce bblst_size by
	factor of 2.
	* config/ia64/ia64.md (movdi_symbolic): Document loss of REG_LABEL
	notes.

From-SVN: r36954