[LLVM Parser] Constant strings are not parsed correctly

Our LLVM parser does not parse constant strings and defaults to a 0 value.
```C
char charArr[5] = {1, 2, 3, 4, 5};  // Will result in a string constant in LLVM
```
gets parsed as if written like
```C
char charArr[5] = {0, 0, 0, 0, 0}; 
```

This should be easy to fix though.