(write_units): Add blockage_function, blockage_range_function,
	max_blockage and max_issue_delay fields to struct function_unit_desc.
	Drop max_busy_cost field.  Write #defines for min/max blockage,
	issue delay, multiplicity, and simultaneity and for BLOCKAGE_BITS
	and INSN_QUEUE_SIZE.
	(main): Compute the new values.

From-SVN: r1950