re PR tree-optimization/47615 (ICE: too deep recursion in phi_translate/phi_translate_1 with -ftree-pre -fno-tree-fre -fno-tree-sra)

2011-02-07  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/47615
	* tree-ssa-sccvn.h (run_scc_vn): Take a vn-walk mode argument.
	* tree-ssa-sccvn.c (default_vn_walk_kind): New global.
	(run_scc_vn): Initialize it.
	(visit_reference_op_load): Use it.
	* tree-ssa-pre.c (execute_pre): Use VN_WALK if in PRE.

	* g++.dg/opt/pr47615.C: New testcase.

From-SVN: r169888