[Issue 24223] __traits(initSymbol) should work for enum types

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24223

--- Comment #1 from Paul Backus <snarwin+bugzilla at gmail.com> ---
Addendum: it turns out that __traits(initSymbol) will compile without error for
enum types whose base types are class, struct, or union types. However, it
returns the initializer of the base type, not the initializer of the enum type.

Example:

---
struct S { int n; }
enum E : S { a = S(123) }

void main()
{
    assert(__traits(initSymbol, E) is __traits(initSymbol, S));
}
---

Obviously, this behavior is incorrect.

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