tree-ssa-loop-ivopts.c (ivopts_data): New field name_expansion_cache.

tree-ssa-loop-ivopts.c (ivopts_data): New field name_expansion_cache.

	* tree-ssa-loop-ivopts.c (ivopts_data): New field
	name_expansion_cache.
	(tree_ssa_iv_optimize_init): Initialize name_expansion_cache.
	(tree_ssa_iv_optimize_finalize): Free name_expansion_cache.
	(strip_wrap_conserving_type_conversions, expr_equal_p): Delete.
	(difference_cannot_overflow_p): New parameter.  Use affine
	expansion for equality check.
	(iv_elimination_compare_lt): Pass new argument.

	testsuite/ChangeLog
	* gcc.dg/tree-ssa/ivopts-lt-2.c: New test.

From-SVN: r213997