[Bug target/70464] [arch64] create a self hosting compiler

[ge...@schorsch-tech.de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70464

--- Comment #4 from ge...@schorsch-tech.de ---
Pi_3 64_bit ~ # grep int64_t /opt/cross/aarch64-linux-gnu/include/stdint.h 
typedef long int                int64_t;
typedef long long int           int64_t;
typedef unsigned long int       uint64_t;
typedef unsigned long long int  uint64_t;