ICE for calldata parameter in an internal function

## Description

The following code triggers the ICE shown bellow in the latest solc version ```0.8.30```. The problem seems to appear with version ```0.6.9``` (tested on remix), which is when ```calldata``` location was permitted for internal functions.

## Steps to Reproduce

```testcase.sol```

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

pragma solidity =0.8.30;

contract C {
function f(S[10] calldata p) internal {
}
}

struct S {
function () internal pure m1;
}
```

```
solc testcase.sol
```

```
Internal compiler error:
/solidity/libsolidity/ast/Types.cpp(2295): Throw in function virtual bool solidity::frontend::StructType::isDynamicallyEncoded() const
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 issue with testcase.sol using solc 0.8.30, then inspect solidity/libsolidity/ast/Types.cpp around line 2295, where the reported assertion is thrown. Done is confirmed when this input no longer produces the reported internal compiler error.

Written by the indexing model from the issue text.