False positive on -Wmismatched-new-delete if variable is reused

```c++
// Type your code here, or load an example.
int square(int num) {
int* g = new int;
delete g;
g = new int[4];
delete[] g;
return num * num;
}
```
https://godbolt.org/z/jcWePexce
->
```
:6:5: warning: 'delete[]' applied to a pointer that was allocated with 'new'; did you mean 'delete'? [-Wmismatched-new-delete]
6 | delete[] g;
| ^ ~~
:3:14: note: allocated with 'new' here
3 | int* g = new int;
| ^
```
No it's not, it's a different pointer that happens to reuse the variable.

The code is admittedly dumb, but feels worth asking about, at least.

Start by reproducing the example at the linked Godbolt entry point with -Wmismatched-new-delete and confirm the diagnostic follows the reused variable rather than the second allocation. Then trace the compiler diagnostic and its existing regression tests; done means this example no longer produces a false-positive warning while genuine mismatched deletes remain diagnosed.

Written by the indexing model from the issue text.