fixes related to #6577

- enforce elim-and in bool-rewriter when invoking hoisting.
- make cnf tactic more resilient to non-normalized input.
- enable eliminate predicates on ground formulas

src/ast/simplifiers/eliminate_predicates.cpp

@@ -1008,8 +1008,6 @@ void eliminate_predicates::reset() {
 
 
 void eliminate_predicates::reduce() {
-    if (!m_fmls.has_quantifiers())
-        return;
     reset();
     init_clauses();
     find_definitions();