[Issue 18315] wrong code for `i > 0`

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18315

ag0aep6g at gmail.com changed:

           What    |Removed                     |Added
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           Keywords|                            |wrong-code

--- Comment #1 from ag0aep6g at gmail.com ---
Whoops. Accidentally hit "submit".

This is what dmd generates for `i > 0`:

----
neg EAX
shr EAX,01Fh
----

In D: `(-i) >> 31`.

That code assumes that negation always flips the sign bit. But it doesn't for
`int.min`. `-int.min` is `int.min` again.

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