[Bug rtl-optimization/97535] On AArch64 memcpy expansion cannot handle length > 32-bit signed int max

[icenowy at aosc dot io via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97535

--- Comment #3 from Icenowy Zheng <icenowy at aosc dot io> ---
A minimal reproduction: (Compile with gcc -c -O1)

```
#include <string.h>

#define SIZE 2181038080

extern char raw_buffer[SIZE];

void setRaw(const void *raw)
{
        memcpy(raw_buffer, raw, SIZE);
}
```