re PR tree-optimization/86489 (ICE in gimple_phi_arg starting with r261682 when build...

re PR tree-optimization/86489 (ICE in gimple_phi_arg starting with r261682 when building 531.deepsjeng_r with FDO + LTO)

gcc/ChangeLog:

2018-07-13  Kugan Vivekanandarajah  <kuganv@linaro.org>
	    Richard Biener  <rguenther@suse.de>

	PR middle-end/86489
	* tree-ssa-loop-niter.c (number_of_iterations_popcount): Check
	that the loop latch destination where phi is defined.

gcc/testsuite/ChangeLog:

2018-07-13  Kugan Vivekanandarajah  <kuganv@linaro.org>

	PR middle-end/86489
	* gcc.dg/pr86489.c: New test.

Co-Authored-By: Richard Biener <rguenther@suse.de>
From-SVN: r262622