[LifetimeSafety] False positive for pointers declared in a loop

[usx95]

bool cond();

void foo() {
    for (; cond();) {
        int obj;
        int* view;
        if (cond()) {
            view = &obj;
        }
        (void)*view; // error: use-after-scope.
    }
}

https://godbolt.org/z/MvrdMaKK4

My idea to fix this is to issue a Kill/Reset when process the DeclStmt. The problem currently is that decl int* view; does not kill the original value from the last iteration.

We can choose to have this warning as this is otherwise a use-of-uninitialised value

[llvmbot]

@llvm/issue-subscribers-clang-temporal-safety

Author: Utkarsh Saxena (usx95)

```cpp bool cond();

void foo() {
for (; cond();) {
int obj;
int* view;
if (cond()) {
view = &obj;
}
(void)*view; // error: use-after-scope.
}
}

https://godbolt.org/z/MvrdMaKK4

My idea to fix this is to issue a Kill/Reset when process the `DeclStmt`.  The problem currently is that decl `int* view;` does not kill the original value from the last iteration.

We can choose to have this warning as this is otherwise a **use-of-uninitialised** value
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