* tree.c (restore_tree_status): Also free up temporary storage
when we finish a toplevel function.
(dump_tree_statistics): Print stats for backend obstacks.
* libgcc2.c (__throw): Don't copy the return address.
* dwarf2out.c (expand_builtin_dwarf_reg_size): Ignore return address.
* except.c (exceptions_via_longjmp): Initialize to 2 (uninitialized).
* toplev.c (main): Initialize exceptions_via_longjmp.
* tree.c: Add extra_inline_obstacks.
(save_tree_status): Use it.
(restore_tree_status): If this is a toplevel inline obstack and we
didn't want to save anything on it, recycle it.
(print_inline_obstack_statistics): New fn.
* function.c (pop_function_context_from): Pass context to
restore_tree_status.
* obstack.h (obstack_empty_p): New macro.
From-SVN: r16050
