re PR c++/9629 (virtual inheritance segfault)

re PR c++/9629 (virtual inheritance segfault)

cp:
	PR c++/9629
	* cp-tree.h (struct language_function): Add in_base_initializer.
	(in_base_initializer): define it.
	(expand_member_init): Remove INIT param.
	* init.c (expand_member_init): Remove INIT param, return the member.
	(emit_mem_initializers): Set in_base_initializer.
	* class.c (build_base_path): Check in_base_initializer.
	* parser.c (cp_parser_mem_initializer): Set in_base_initializer.
	* pt.c (tsubst_initializer_list): Likewise.
testsuite:
	PR c++/9629
	* g++.dg/init/ctor2.C: New test.

From-SVN: r64438