[Issue 20052] New: SIMD 32 bytes causes obscure segfault on windows 64

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20052

          Issue ID: 20052
           Summary: SIMD 32 bytes causes obscure segfault on windows 64
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Windows
            Status: NEW
          Severity: critical
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: sahmi.soulaimane at gmail.com

The following program crashed inexplicably:
```
struct y { __vector(long[4]) v; }
y get()
{
    y t;
    return t;
}
void main() { get(); }
```
compiler flags: -mcpu=avx2

Only crashes on Windows 64.

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