[Bug tree-optimization/84419] [8 Regression] SPEC CPU2017/CPU2006 521/621, 527/627, 554/654, 445, 454, 481, 416 runfails after r256628 with march=skylake-avx512

[alexander.nesterovskiy at intel dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84419

--- Comment #2 from Alexander Nesterovskiy <alexander.nesterovskiy at intel dot 
com> ---
I've made a quite small reproducer:
---
$ cat reproducer.c
#include <stdio.h>
#include <string.h>

#define SIZE 400

int  foo[SIZE];
char bar[SIZE];

void __attribute__ ((noinline)) foo_func(void)
{
  int i;
  for (i = 1; i < SIZE; i++)
    if (bar[i])
      foo[i] = 1;
}

int main()
{
  memset(bar, 1, sizeof(bar));
  foo_func();
  return 0;
}
$ gcc -O3 -march=skylake-avx512 -g reproducer.c
$ ./a.out
Segmentation fault      (core dumped)