Replace conditions in quantified statement expressions

Author: qinheping

regression/cbmc/Quantifiers-statement-expression/main.c

@@ -4,7 +4,7 @@ int main()
   // no side effects!
   int j = 0;
   int a[5] = {0 , 0, 0, 0, 0};
-  assert(__CPROVER_forall { int i;  ({ int j = i; i=i; if(i < 0 || i >4) i = 1;  ( a[i] < 5); }) });
+  assert(__CPROVER_forall { int i;  ({ int j = i; int cond = i < 0 || i >4; if(cond) i = 1;  ( a[i] < 5); }) });
   // clang-format on
 
   return 0;

src/ansi-c/goto-conversion/goto_clean_expr.cpp

@@ -211,19 +211,16 @@ static exprt convert_statement_expression(
     // path_condition && cond.
     case goto_program_instruction_typet::GOTO:
     {
-      if(!current_it->condition().is_true())
+      exprt condition = current_it->condition();
+      replace_expr(value_map, condition);
+      if(!condition.is_true())
       {
         auto next_it = current_it->targets.front();
         exprt copy_path_condition = path_condition;
-        replace_mapt copy_symbol_map = value_map;
-        auto copy_condition = current_it->condition();
-        path_condition =
-          and_exprt(path_condition, not_exprt(current_it->condition()));
+        path_condition = and_exprt(path_condition, not_exprt(condition));
         current_it++;
         paths.push_back(
-          next_it,
-          and_exprt(copy_path_condition, copy_condition),
-          copy_symbol_map);
+          next_it, and_exprt(copy_path_condition, condition), value_map);
       }
       else
       {