re PR rtl-optimization/53125 (Very slow compilation on SPARC)

re PR rtl-optimization/53125 (Very slow compilation on SPARC)

	PR rtl-optimization/53125
	* regstat.c (regstat_bb_compute_ri): Take new local_live_last_luid
	argument.  Simplify calculation of REG_LIVE_LENGTH for regnos that
	die in the basic block.  Correctly top off REG_FREQ and
	REG_FREQ_CALLS_CROSSED.
	Remove do_not_gen.
	(regstat_compute_ri): Allocate and free local_live_last_luid.
	Remove do_not_gen.
	(regstat_bb_compute_calls_crossed): Correctly top off
	REG_FREQ_CALLS_CROSSED.

From-SVN: r187633