Problems with type inference around `printf`

[John Källén]

(See #1337 opened by @yangzao for the binary in question, program 4)
Original code:

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.