Modify code of special value handline for bytecode.
Modify code of special value handline for bytecode.


This is code clean up of change
1bba729b276a3f80680104057213dea80487a29c (xyzzy.src : fix let, let*.).
Behaviour should not change.

NobuoK/xyzzy,NobuoK/xyzzy,NobuoK/xyzzy,NobuoK/xyzzy,NobuoK/xyzzy