re PR tree-optimization/87197 (ICE in is_gimple_reg_type at gimple-expr.h:75 since...

re PR tree-optimization/87197 (ICE in is_gimple_reg_type at gimple-expr.h:75 since r264021)

2018-09-03  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/87197
	* tree-ssa-sccvn.c (vn_nary_build_or_lookup_1): Mark the new def
	visited.  CSE the VN_INFO hashtable lookup.

	* gcc.dg/torture/pr87197.c: New testcase.

	PR tree-optimization/87169
	* tree-ssa-sccvn.c (do_rpo_vn): When marking loops for not
	iterating make sure there's no extra backedges from irreducible
	regions feeding the header.  Mark the destination block
	executable.

	* gcc.dg/torture/pr87169.c: New testcase.

From-SVN: r264057