[Test Generation] Reduce memory footprint by reusing the same Boogie program for multiple test generation queries #4530
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In draft stage because boogie-org/boogie/pull/780 should be merged first.
This PR reduces the memory footprint / running time of test generation by reusing the same in-memory representation of a Boogie program. Previously, Dafny would have to copy the entire Boogie program to a string and parse/resolve/typecheck it again for every new test Dafny generates. With some minor changes to Boogie, this deep-copy procedure is no longer necessary in Block and InlinedBlock modes (but still necessary for Path-based test generation - this is something I will have to work next)
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