re PR c++/70202 (ICE on invalid code on x86_64-linux-gnu in build_simple_base_path, at cp/class.c:579)

/cp
2016-06-15  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/70202
	* decl.c (xref_basetypes): Revert r117839 changes; add fix-up
	code at the end of the for loop; also revert r159637 changes,
	add back the gcc_assert.
	* cp-tree.h (xref_basetypes): Adjust declaration.
	* parser.c (cp_parser_class_head): Adjust xref_basetypes call.

/testsuite
2016-06-15  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/70202
	* g++.dg/inherit/crash6.C: New.
	* g++.dg/inherit/union2.C: Likewise.
	* g++.dg/inherit/virtual12.C: Likewise.
	* g++.dg/inherit/virtual13.C: Likewise.
	* g++.dg/inherit/virtual1.C: Tweak dg-* tests.

From-SVN: r237482