[clang] Miscompilation at -O3

[cardigan1008]

This code prints 15 at -O3, but prints 5 at -O0/1/2:

int printf(const char *, ...);
static int a[] = {4294967295, 5};
int b, c;
int main() {
  a[1] = b = 5;
  unsigned d = -13;
  for (; d >= 8; d = a[0] + d + 6) {
    int *e = &b;
    *e = a[0] - -1 + b;
  }
  a[c];
  printf("%d\n", b);
}

Compiler Explorer: https://godbolt.org/z/4xdPqcjPb

Bisected to 6d6eea9, which was committed by @fhahn

[hstk30-hw]

Don't ignore the warning.

<source>:2:19: warning: implicit conversion from 'long' to 'int' changes value from 4294967294 to -2 [-Wconstant-conversion]
    2 | static int a[] = {4294967294, 5};
      |                  ~^~~~~~~~~~