Don't emit multiple .line directives before an instruction when disassembling

When running baksmali the disassembly can have multiple `.line` directives before an instruction, like this:
```
.line n
.line n+1
.line n+2

```
This happens when the line number table have line information for PCs which are not at an exact instruction boundary (in the example above `.line n` and `.line n+1` are on PCs between the previous instruction and ``. The disassembly should only have `.line` directives for the PCs matching instruction boundaries. So only
```
.line n+2

```
for the example above.

Typically this is caused by R8 compiling with PC -to-PC based line tables to be able to share then and save on DEX size.