[P4-Constraints] Added ConstraintSolver hook to export constraints to… #176
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Adds ConstraintSolver::ExportConstraintsToTargetSolver that adds P4-Constraints constraints to a z3 solver, renaming variables according to a given SymbolicEnvironment if necessary.
P.S. To unblock internal Google code relying on these changes, I've rolled back some problematic commits in this PR. Let's commit this to a branch (i.e., not master) if we can. I don't think I can make a new branch on my end.