PR tree-optimization/23509

	* tree-cfg.c (replace_uses_by): Use replace_exp.
	* tree-ssa-loop-ivopts.c (get_ref_tag): Assert that dereferenced
	pointers have name_mem_tag or type_mem_tag set.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@104099 138bc75d-0d04-0410-961f-82ee72b054a4