[Bug tree-optimization/117222] [15 regression] Missed optimization with with std::vector resize in loop since r15-575-gda73261ce7731b

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117222

--- Comment #4 from Sam James <sjames at gcc dot gnu.org> ---
With prange, evrp has:
```
[-Global Exported: _17 = [irange] long int [-INF, -1][1, +INF]-]
```
and then vrp1 has:
```
[...]
{+Global Exported: _69 = [prange] int * [1, +INF]+}
Global Exported: _68 = [irange] long unsigned int [0, 0]
{+Global Exported: _67 = [irange] long int [0, 0]+}
Global Exported: _82 = [irange] long unsigned int [0, 9223372036854775804] MASK
0x7fffffffffffffff VALUE 0x0
int main ()
{
@@ -91,7 +93,6 @@ int main ()
  int * _44;
  int * _53;
  int * _61;
[-  long int _67;-]
  int * _69;
  long unsigned int _82;
  long unsigned int _95;
@@ -101,7 +102,6 @@ int main ()
  int * _130;
  long unsigned int _149;
  long unsigned int _156;
[-  long unsigned int _161;-]
[...]
````

Then forwprop3 ends up keeping bbs 9/10/11/15/12 and it all goes wrong from
there.