* configure.in: define IA64 for portability. (HP aC++/ANSI C doesn't

  define __ia64__.)
  don't check libunwind stuff.
  check __libc_ia64_register_backing_store_base.

* defines.h: declare rb_ia64_bsp and rb_ia64_flushrs.
  (flush_register_windows): call rb_ia64_flushrs on IA64.

* ia64.s: new file for IA64.
  it is separated from C program files because
  Intel C++ Compiler for IA64 doesn't support inline assembly.

* common.mk (ia64.$(OBJEXT)): new target.

* ruby.h (RUBY_INIT_STACK): defined.
  (ruby_init_stack): declared for RUBY_INIT_STACK.

* main.c (main): precedes RUBY_INIT_STACK before ruby_init.

* gc.c (rb_gc_register_stack_start): new global variable on IA64.
  (garbage_collect): simplify register stack marking code.
  don't use libunwind.
  (Init_stack): initialize rb_gc_register_stack_start.
  (ruby_init_stack): new function for RUBY_INIT_STACK.

* eval.c (struct thread): add bstr_pos member for original position of
  register stack.
  (rb_thread_save_context): simplify register stack saving code.
  don't use libunwind.
  (rb_thread_restore_context_0): new function.  moved from
  rb_thread_restore_context except the stack position checking code.
  don't use libunwind for IA64 register stack.
  (register_stack_extend): new function.
  (stack_extend): make it self-recursive with
  the stack position checking code in old rb_thread_restore_context.
  (rb_thread_restore_context): just call stack_extend.
  (flush_register_windows): removed.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@9745 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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