[clang-tidy] readability-implicit-bool-conversion.AllowPointerConditions doesn't work on more complex expressions

```c++
struct Obj {
int data;
}

void foo(Obj* obj) {
// OK
if (obj) {
if (obj->data == 42) {
}
}

// Warning
if (obj && obj->data == 42) {
}
}
```

If pointer is dereferenced in the same conditional expression after null pointer check then clang-tidy warns even if `readability-implicit-bool-conversion.AllowPointerConditions` is set to true. I believe that this option should allow this too.

Start by reproducing the provided C++ example with clang-tidy's readability-implicit-bool-conversion check and AllowPointerConditions enabled. Trace how the check handles a pointer dereference after a null check within the same conditional expression. Done means the combined condition no longer warns when this option is enabled, with coverage for the reported example.

Written by the indexing model from the issue text.