Parenthesize binary instructions in JIT codegen

kernel/modelverse_jit/tree_ir.py

@@ -355,7 +355,7 @@ class BinaryInstruction(Instruction):
     def generate_python_use(self, code_generator):
         """Generates a Python expression that retrieves this instruction's
            result. The expression is returned as a string."""
-        return '%s %s %s' % (
+        return '(%s %s %s)' % (
             self.lhs.generate_python_use(code_generator),
             self.operator,
             self.rhs.generate_python_use(code_generator))