[clang-tidy] Fix false positives about reinitialization detection in `bugprone-use-after-move` (#197438)
When calling base class's `operator=` through derived object, a implicit
cast with `UncheckedDerivedToBase` will be generated:
```
void foo() {
Base b;
Derived d;
std::move(d);
d = b;
}
```
AST for `d = b`'s `d`:
```
|-ImplicitCastExpr <col:3> 'GH62206::Base' lvalue <UncheckedDerivedToBase (Base)>
| `-DeclRefExpr <col:3> 'Derived' lvalue Var 0x1d11a400 'd' 'Derived'
```
This patch considers possible `implicitCastExpr` in the reinit matcher,
i didn't find other cast situtaions which may causes other problems, so
i use `ignoringImpCasts` directly rather than specific to
`CK_UncheckedDerivedToBase` here.
Closes #62206.
---------
Co-authored-by: Zeyi Xu <zeyi2@nekoarch.cc>
llvm-project
a1d40dd0 - [clang-tidy] Fix false positives about reinitialization detection in `bugprone-use-after-move` (#197438)
