re PR middle-end/62178 ([AArch64] Performance regression on matrix matrix multiply...

re PR middle-end/62178 ([AArch64] Performance regression on matrix matrix multiply due to r211211)

	PR tree-optimization/62178
	* tree-ssa-loop-ivopts.c (cheaper_cost_with_cand): New function.
	(iv_ca_replace): New function.
	(try_improve_iv_set): New parameter try_replace_p.
	Break local optimal fixed-point by calling iv_ca_replace.
	(find_optimal_iv_set_1): Pass new argument to try_improve_iv_set.

	gcc/testsuite/ChangeLog
	PR tree-optimization/62178
	* gcc.target/aarch64/pr62178.c: New test.

From-SVN: r218855