Revert "cinn(py-dsl): skip eval string in python-dsl (PaddlePaddle#61380) (PaddlePaddle#61586)"

This reverts commit a37f6fb.

Author: hanhaowen-mt

python/cinn/compiler/expr_executor.py

@@ -81,15 +81,14 @@ def visit(self, node):
             value = exec_func(cls_fields)
         else:
             new_node = node.__class__(**cls_fields)
+            ast.copy_location(new_node, node)
+            new_node = ast.Expression(new_node)
             value = self.exec_expr(new_node)
         return self.save_temp_value(value)
 
     def exec_expr(self, node):
-        assert isinstance(node, ast.expr)
-        if type(node).__name__ == "Constant":
-            return node.value
-
-        node = ast.Expression(node)
+        if isinstance(node, ast.expr):
+            node = ast.Expression(body=node)
         node = ast.fix_missing_locations(node)
         exec = compile(node, filename="<ast>", mode="eval")
         return eval(exec, self.var_table)