Fix use-after-free in obj_free() for env objects - #6328
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A reference to an invalid address might occur in `is_dead()` of `obj_free()` called from `incremental_sweep_phase()`. This would happen if the heap page was freed ahead of time in the same `incremental_sweep_phase()`. fixed mruby#6326
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A reference to an invalid address might occur in
is_dead()ofobj_free()called fromincremental_sweep_phase().This would happen if the heap page was freed ahead of time in the same
incremental_sweep_phase().fixed #6326