Revert "Update for_helpers.py"

This reverts commit c9680dc.

Author: BobTheBuidler

mypyc/irbuild/for_helpers.py

@@ -1164,7 +1164,9 @@ class ForFilter(ForGenerator):
     """Generate optimized IR for a for loop over filter(f, iterable)."""
 
     def need_cleanup(self) -> bool:
-        return self.gen.need_cleanup()
+        # The wrapped for loops might need cleanup. We might generate a
+        # redundant cleanup block, but that's okay.
+        return True
 
     def init(self, index: Lvalue, func: Expression, iterable: Expression) -> None:
         self.filter_func_def = func