[Issue 11003] Improve .di generation

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=11003

--- Comment #3 from Kenji Hara <k.hara.pg at gmail.com> ---
One more case:

enum isInt(T) = is(T == int);

For that, the generated di still uses old verbose style:

template isInt(T)
{
    enum isInt = is(T == int);
}

-->
https://github.com/D-Programming-Language/dmd/pull/4629

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