Ruby

• add RUBY_TYPED_FREE_IMMEDIATELY to data types which only use
  safe functions during garbage collection such as xfree().
  On default, T_DATA objects are freed at same points as fianlizers.
  This approach protects issues such as reported by [ruby-dev:35578].
  However, freeing T_DATA objects immediately helps heap usage.
  Most of T_DATA (in other words, most of dfree functions) are safe.
  However, we turned off RUBY_TYPED_FREE_IMMEDIATELY by default
  for safety.
• cont.c: ditto.
• dir.c: ditto.
• encoding.c: ditto.
• enumerator.c: ditto.
• error.c: ditto.
• file.c: ditto.
• gc.c: ditto.
• io.c: ditto.
• iseq.c: ditto.
• marshal.c: ditto.
• parse.y: ditto.
• proc.c: ditto.
• process.c: ditto.
• random.c: ditto.
• thread.c: ditto.
• time.c: ditto.
• transcode.c: ditto.
• variable.c: ditto.
• vm.c: ditto.
• vm_backtrace.c: ditto.
• vm_trace.c: ditto.
• ext/bigdecimal/bigdecimal.c: ditto.
• ext/objspace/objspace.c: ditto.
• ext/stringio/stringio.c: ditto.
• ext/strscan/strscan.c: ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43466 b2dd03c8-39d4-4d8f-98ff-823fe69b080e