Commits on Oct 6, 2021

1. Fix Ractor.make_shareable changing locals for Procs …

   env_copy() uses rb_ary_delete_at() with a loop counting up while
   iterating through the list of read only locals. rb_ary_delete_at() can
   shift elements in the array to an index lesser than the loop index,
   causing locals to be missed and being set to Qfalse in the returned
   environment.
   
   Iterate through the list of locals in reverse instead, this way we
   always remove the last element and not cause elements in the array to
   shift. This ensures that all read only locals are handled.
   
   [Bug #18023]

   

   XrXr committed Oct 6, 2021
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