separate Thread type (func or proc) explicitly.

* vm_core.h (rb_thread_struct): introduce new fields `invoke_type`
  and `invoke_arg`.
  There are two types threads: invoking proc (normal Ruby thread
  created by `Thread.new do ... end`) and invoking func, created
  by C-API. `invoke_type` shows the types.

* thread.c (thread_do_start): copy `invoke_arg.proc.args` contents
  from Array to ALLOCA stack memory if args length is enough small (<8).
  We don't need to keep Array and don't need to cancel using transient heap.

* vm.c (thread_mark): For func invoking threads, they can pass (void *)
  parameter (rb_thread_t::invoke_arg::func::arg). However, a rubyspec test
  (thread_spec.c) passes an Array object and it expect to mark it.
  Clealy it is out of scope (misuse of `rb_thread_create` C-API). However,
  I'm not sure someone else has such kind of misunderstanding.
  So now we mark conservatively this (void *) arg with rb_gc_mark_maybe.

  This misuse is found by this error log.
  http://ci.rvm.jp/results/trunk-theap-asserts@silicon-docker/1448164


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65622 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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