Ruby » Ruby master

• gc.c (rb_objspace_t::heap_pages): rename field names:
  • used -> allocated_pages
  • increment -> allocatable_pages
  • length -> sorted_length
    And remove unused `limt' field.
• gc.c: rename macros:
  • heap_pages_used -> heap_allocated_pages
  • heap_pages_length -> heap_pages_sorted_length
  • heap_pages_increment -> heap_allocatable_pages
• gc.c (gc_stat_internal): fix symbol names
  ref: [Feature #9924]
  https://docs.google.com/spreadsheets/d/11Ua4uBr6o0k-nORrZLEIIUkHJ9JRzRR0NyZfrhEEnc8/edit?usp=sharing
  Yellow color fields in this table are changed.
• test/ruby/test_gc.rb: catch up this change.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47471 b2dd03c8-39d4-4d8f-98ff-823fe69b080e