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study_chunk: avoid mutating regexp program within GOSUB
gh16947 and gh17743: studying GOSUB may restudy in an inner call (via a mix of recursion and enframing) something that an outer call is in the middle of looking at. Let the outer frame deal with it. (CVE-2020-12723) (cherry picked from commit c4033e740bd18d9fbe3456a9db2ec2053cdc5271)
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