[Bug tree-optimization/122599] [16 regression] ICE when building busybox-1.36.1 at -O3

[sjames at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122599

--- Comment #1 from Sam James <sjames at gcc dot gnu.org> ---
```
int *get_next_block_dbuf;
int get_next_block_dbufCount;
char get_next_block_tmp_byte;
int bound;

void get_next_block(unsigned runCnt) {
  for (int i = 0; i < bound; i++)
    while ((int)--runCnt >= 0)
      get_next_block_dbuf[get_next_block_dbufCount] = get_next_block_tmp_byte;
}
```