re PR tree-optimization/53090 (suboptimal ivopt)

	PR tree-optimization/53090
	* tree-ssa-loop-ivopts.c (enum comp_iv_rewrite): New enum value
	COMP_IV_EXPR_2.
	(extract_cond_operands): Detect condition with IV on both sides
	and return COMP_IV_EXPR_2.
	(find_interesting_uses_cond): Add iv_use for both IVs in condition.
	(rewrite_use_compare): Simplify by removing call to function
	extract_cond_operands.

From-SVN: r247893