Merge pull request #16164 from phrwlk/fix/formal-encoding-context-clear-const

refactor(formal): remove unused `clear()`/`solver()` from `EncodingContext`

Author: blishko

libsolidity/formal/EncodingContext.h

@@ -44,9 +44,6 @@ class EncodingContext
 	void resetUniqueId();
 	/// Returns the current fresh slack id and increments it.
 	unsigned newUniqueId();
-	/// Clears the entire context, erasing everything.
-	/// To be used before a model checking engine starts.
-	void clear();
 
 	/// Sets the current solver used by the current engine for
 	/// SMT variable declaration.
@@ -139,12 +136,7 @@ class EncodingContext
 	void pushSolver();
 	void popSolver();
 	void addAssertion(smtutil::Expression const& _e);
-	size_t solverStackHeight() { return m_assertions.size(); } const
-	smtutil::SolverInterface* solver()
-	{
-		solAssert(m_solver, "");
-		return m_solver;
-	}
+	size_t solverStackHeight() const { return m_assertions.size(); }
 	//@}
 
 	SymbolicState& state() { return m_state; }