re PR tree-optimization/80153 (ivopt generate wrong code)

re PR tree-optimization/80153 (ivopt generate wrong code)

	PR tree-optimization/80153
	* tree-affine.c (aff_combination_to_tree): Get base pointer from
	the first element of pointer type aff_tree.  Build result expr in
	aff_tree's type.
	(add_elt_to_tree): Convert to type unconditionally.  Remove other
	fold_convert calls.
	* tree-ssa-loop-ivopts.c (alloc_iv): Pass in consistent types.
	(rewrite_use_nonlinear_expr): Check invariant using iv information.
	gcc/testsuite
	PR tree-optimization/80153
	* gcc.c-torture/execute/pr80153.c: New.

From-SVN: r246810