[Issue 20693] align(N): larger than 2^^30 causes unexpected behavior

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20693

--- Comment #1 from Hiroki Noda <kubo39 at gmail.com> ---
ShlExp also.

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align(1 << 31) struct S {};  // Error: alignment must be an integer positive
power of 2, not -2147483648
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