debuginfo/evec-in-struct.rs fails on master

Relevant output:

```
    error: line not found in debugger output: $2 = {x = {6, 7, 8}, y = {{9, 10}, {11, 12}}}
```

...

```
    $2 = {x = {6, 7, 8}, y = {{9, 10}, {12, 0}}}
```

GDB version:

```
GNU gdb (GDB) Fedora 7.7.1-19.fc20
```

I'm not sure why this fails on my system and not on the build bots.
