* eval_load.c (Init_load): delay allocating an array for rb_load_path

  to avoid GC problem in very early stage.
  (RUBY_GC_STRESS causes GC in such stage.)

* variable.c (rb_gc_mark_global_tbl): rb_global_tbl may be 0 in
  very early stage.

* thread.c (thread_cleanup_func) [IA64]: clear register stack position.
  (thread_start_func_2) [IA64]: record the beginning of register
  stack using extra argument.
  (rb_gc_save_machine_context) [IA64]: record the end of register
  stack.

* gc.c [IA64] (SET_STACK_END): record the end of register stack.
  (garbage_collect) [IA64]: use recorded register stack area for
  GC marking.
  (yarv_machine_stack_mark) [IA64]: GC mark from the register stack
  area.

* yarvcore.c [IA64] (rb_gc_register_stack_start): defined.
  (Init_VM): store th->self on stack to fix GC problem.
  (Init_yarv) [IA64]: initialize the beginning of register stack.

* yarvcore.h (struct rb_thread_struct) [IA64]: new members for
  register stack area.

* thread_pthread.ci (thread_start_func_1) [IA64]: call
  thread_start_func_2 with the end of register stack.

* cont.c (struct rb_context_struct) [IA64]: new members for register
  stack area.
  (cont_mark) [IA64]: GC mark from register stack area.
  (cont_free) [IA64]: free saved register stack.
  (cont_save_machine_stack) [IA64]: record the position and contents
  of the register stack.
  (cont_capture): store cont->self on stack to fix GC problem.
  (cont_restore_1) [IA64]: restore the register stack.
  [IA64] (register_stack_extend): new function.
  (cont_restore_0) [IA64]: call register_stack_extend instead of
  cont_restore_1.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@12537 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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