Wojciech Mitros 58987215dc functions: add helper same_signature method ...

When deciding whether two functions have the same
signature, we have to check if they have the same name
and parameter types. Additionally, if they're represented
by pointers, we need to check if any of them is a nullptr.
This logic is used multiple times, so it's extracted to
a separate function.
To use this function, the `used_by_user_aggregate` method
takes now a function instead of name and types list - we
can do it because we always use it with an existing user
function (that we're trying to drop).
The method will also be useful when we'll be not dropping,
but replacing a user function.

2023-02-07 10:15:12 +01:00

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