re PR c++/5571 (crash in initialization of a static variable)
PR c++/5571
* stor-layout.c (layout_decl): Reset the RTL for the decl.
* class.c (layout_class_type): Remember incomplete static
variables.
(finish_struct_1): Call complete_vars, not
hack_incomplete_structures.
* cp-tree.h (hack_incomplete_structures): Rename to ...
(complete_vars): ... this.
(struct saved_scope): Remove incomplete.
(namespace_scope_incomplete): Remove.
* decl.c (struct binding_level): Remove incomplete.
(incomplete_vars): New variable.
(mark_binding_level): Don't mark incomplete.
(print_binding_level): Don't print it.
(mark_saved_scope): Don't mark incomplete.
(pushdecl): Use maybe_register_incopmlete_var.
(cxx_init_decl_processing): Register incomplete_vars for GC.
(start_decl_1): Clarify error message.
(hack_incomplete_vars): Remove.
(maybe_register_incomplete_var): New function.
(complete_vars): Likewise.
* g++.dg/opt/static2.C: New test.
From-SVN: r51978