re PR tree-optimization/40087 (Number of iterations analysis wrong)

re PR tree-optimization/40087 (Number of iterations analysis wrong)

	PR tree-optimization/40087
	* tree-ssa-loop-niter.c (number_of_iterations_ne_max,
	number_of_iterations_ne): Rename never_infinite argument.
	(number_of_iterations_lt_to_ne, number_of_iterations_lt,
	number_of_iterations_le): Handle pointer-type ivs when
	exit_must_be_taken is false.
	(number_of_iterations_cond):  Do not always assume that
	exit_must_be_taken if the control variable is a pointer.

	* gcc.dg/tree-ssa/pr40087.c: New test.

From-SVN: r147727