[Issue 24819] Optimizer changes result of float calculations on 32-bit

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24819

--- Comment #1 from Dennis <dkorpel at live.nl> ---
Reduced:

```
import core.stdc.stdio;

pragma(inline, true)
double sqrt(double x)
{
    static import core.math;
    return core.math.sqrt(x);
}

void main()
{
    double q = -1.0;
    double r = q + 0.1;
    double result = sqrt(-r);
    printf("%f\n", result);
}
```

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