Handle l-values and pointers in conditional operators

[usx95]

#include <string>

void foo(bool cond) {
    std::string* res;
    {
        std::string a = "a";
        std::string b = "b";
        res = cond ? &a : &b;
        res = &(cond ? a : b);
    }
    (void)*res;
}

void bar(bool cond) {
    std::string* res;
    {
        std::string a = "a";
        std::string b = "b";
        std::string* p = &a;
        std::string* q = &b;
        res = cond ? p : q;
    }
    (void)*res;
}

https://godbolt.org/z/rf6WKPG51

[llvmbot]

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

Author: Utkarsh Saxena (usx95)

```cpp #include <string>

void foo(bool cond) {
std::string* res;
{
std::string a = "a";
std::string b = "b";
res = cond ? &a : &b;
res = &(cond ? a : b);
}
(void)*res;
}

void bar(bool cond) {
std::string* res;
{
std::string a = "a";
std::string b = "b";
std::string* p = &a;
std::string* q = &b;
res = cond ? p : q;
}
(void)*res;
}

https://godbolt.org/z/rf6WKPG51
</details>