Ruby

• gc.c: allow multiple heaps.
  Now, objects are managed by page. And a set of pages is called heap.
  This commit supports multiple heaps in the object space.
  • Functions heap_* and rb_heap_t manages heap data structure.
  • Functions heap_page_* and struct heap_page manage page data
    strcuture.
  • Functions heap_pagse_* and struct rb_objspace_t::heap_pages
    maintains all pages.
    For example, pagaes are allocated from the heap_pages.
    See https://bugs.ruby-lang.org/projects/ruby-trunk/wiki/GC_design
    and https://bugs.ruby-lang.org/attachments/4015/data-heap_structure_with_multiple_heaps.png
    for more deitals.
    Now, there is only one heap called `eden', which is a space for all
    new generated objects.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43388 b2dd03c8-39d4-4d8f-98ff-823fe69b080e