Move control path selection from fuzzer runtime to fuzzer rendering time

[albertZhangTJ]

Currently we are using same template for each kind of node and modify the control flow using boolean values rendered into fuzzer code. This will lead to a lot of dead code such as

if (false){
    if (false){
        //...
    }
    else {
        //...
    }
}

Despite these will be optimized away by compiler thus does not affect execution efficiency, it is still desirable to forward these overhead to fuzzer rendering time and generate neater and more readable code.

[albertZhangTJ]

This might not be much of a performance improvement as expected since Java compiler/runtime is already doing a pretty good job at optimizing away the unused/unreachable paths.