ICE for emit statement with argument of function type

## Description

The following code triggers an ICE when compiling with `--ir`. I think the issue comes from passing a function type that is not identical but implicitly convertible to an indexed event parameter.

## Steps to Reproduce

`testcase.sol`

```solidity
// SPDX-License-Identifier: GPL-3.0

pragma solidity =0.8.30;

contract C {
event W(function () external view indexed p);

function f(function () external pure p) public {
emit W(p);
}
}
```

`
solc --ir testcase.sol
`

```
Internal compiler error:
/solidity/libsolidity/codegen/ir/IRGeneratorForStatements.cpp(1093): Throw in function virtual void solidity::frontend::IRGeneratorForStatements::endVisit(const solidity::frontend::FunctionCall&)
Dynamic exception type: boost::wrapexcept
std::exception::what: Solidity assertion failed
[solidity::util::tag_comment*] = Solidity assertion failed
```

## Environment

- Compiler version: ```0.8.30```

Reproduce the ICE with the provided testcase.sol and `solc --ir testcase.sol`. Start at libsolidity/codegen/ir/IRGeneratorForStatements.cpp:1093, then trace the failing function-call handling for the emitted event argument. Done means the example no longer produces an internal compiler error and regression coverage verifies the behavior.

Written by the indexing model from the issue text.