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cont.c: fiber local svar

• cont.c (cont_restore_thread): svar should be separate per fibers.
  [ruby-core:51331] [Bug #7678]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38981 b2dd03c8-39d4-4d8f-98ff-823fe69b080e