re PR rtl-optimization/45912 (Patch for PR tree-optimization/44972 caused 2500+ FAILs on Solaris 2/SPARC)

	PR rtl-optimization/45912
	* ira-costs.c (ira_tune_allocno_costs_and_cover_classes): Test the
	regno of registers instead of their index to compute the alignment.

From-SVN: r165437