re PR tree-optimization/87349 (ICE: Segmentation fault (in useless_type_conversion_p or is_gimple_reg_type))

2018-09-19  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/87349
	PR tree-optimization/87342
	* tree-ssa-sccvn.c (do_rpo_vn): Iterate max_rpo computation.

	* gcc.dg/torture/pr87349-1.c: New testcase.
	* gcc.dg/torture/pr87349-2.c: Likewise.
	* gcc.dg/torture/pr87342.c: Likewise.

From-SVN: r264419