* gc.c: change additional allocation policy.

  Introduce new environement variable
  GC_HEAP_FREE_SLOTS_GOAL_RATIO (goal_ratio) to calculate the ratio
  of additional memory.

  Before this change, we add pages with the following formula
  (when free_slots < total_pages * RUBY_GC_HEAP_FREE_SLOTS_MIN_RATIO):
    next_pages = total_pages * RUBY_GC_HEAP_GROWTH_FACTOR

  This addition can allocate too much.

  With this change, we increase pages to satisfy the following formula:
    next_free_slots = next_total_slots * goal_ratio
  where
    next_free_slots = free_slots + adding_slots
    next_total_slots = total_slots + adding_slots.

  If you want to prepare many free slots, increase this ratio.

  If this variable is 0, then simply multiply
  RUBY_GC_HEAP_GROWTH_FACTOR.

* gc.c (get_envparam_double): enable to accept 0.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54453 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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