* eval.c (cc_mark): frees the continuation's stack if its thread

  is dead to avoid recursive gc that segfaults.  [ruby-core:13889]
  a patch by Brent Roman <brent AT mbari.org>.

* eval.c (rb_cont_check): checks for valid continuation instance.

* eval.c (rb_callcc): assigns th->thread before scope_dup() to
  avoid segfaults if this scope_dup() triggers a gc pass.
  a patch by Brent Roman <brent AT mbari.org>.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@21353 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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