* 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

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