Problems with type inference around `printf`

(See #1337 opened by @yangzao for the binary in question, program 4)
Original code:
```C
char *str = "global string";
printf("%s", str);
```
Decompile code:
```
word64 str = 0x006007A8;
printf("%s", *str);
```
`str` is a `char *` in the original code. But in the decompiled code, it is defined as a `word64` (I assume it's `int64_t`). And `printf` tries to access it with deferencing.