Ruby » Ruby master

• vm_args.c: protect value stack from calling other methods
  during complex parameter setting process (splat, kw, and so on).
  [Bug #11027]
• vm_core.h: remove rb_thead_t::mark_stack_len.
  With this modification, we don't need to use th->mark_stack_len.
• test/ruby/test_keyword.rb: add a test.
• cont.c (cont_capture): catch up this fix.
• vm.c (rb_thread_mark): ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@50172 b2dd03c8-39d4-4d8f-98ff-823fe69b080e