* gc.c: rename initial_xxx variables to gc_params.xxx.
  They are not only used initial values.
  Chikanaga-san: Congratulations on RubyPrize!



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43757 b2dd03c8-39d4-4d8f-98ff-823fe69b080e