[Issue 14212] frexp for const and immutable fails to compile

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=14212

--- Comment #5 from Илья Ярошенко <ilyayaroshenko at gmail.com> ---
The `value` should be mutable variable since it is changed inside function. The
fix adds `Unqual!T vf = value;` to fix this issue.

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