Optimize conditional jumps

Given bytecode:
```
0	OpTrue
1	OpJumpIfTrue	2	(6)
4	OpPop
5	OpTrue
6	OpJumpIfTrue	2	(11)
9	OpPop
10	OpTrue
11	OpJumpIfTrue	2	(16)
14	OpPop
15	OpTrue
```
Can be optimized to 
```
0	OpTrue
1	OpJumpIfTrue	2	(16)
4	OpPop
5	OpTrue
6	OpJumpIfTrue	2	(16)
9	OpPop
10	OpTrue
11	OpJumpIfTrue	2	(16)
14	OpPop
15	OpTrue
```