[pull] master from ruby:master #631
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Currently, root fibers of threads do not have a corresponding Ruby object backing it by default (it does have one when an object is required, such as when Fiber.current is called). This is a problem for the new GC weak references design in #12606 since Thread is not declared as having weak references but it does hold weak references (the generic ivar cache). This commit changes it to always allocate a Fiber object for the root fiber.
For the precondition of `RTYPEDDATA_P` that the argument must be a Ruby object of `::RUBY_T_DATA`.
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