Boaz Brickner fcd38a4d7f Add support for importing C++ namespaces (#5103) ...

This adds support for having different C++ `NameScope`s (and not just
the main `Cpp` scope), and we keep a pointer to `clang::DeclContext`
these scopes so we can look up C++ names in the right part of the AST.

C++ Interop Demo with a namespace:

```c++
// hello_world.h

namespace some_namespace {

void hello_world();

}  // namespace some_namespace
```

```c++
// hello_world.cpp

#include <cstdio>

namespace some_namespace {

void hello_world() { printf("Hello World!\n"); }

}  // namespace some_namespace
```

```carbon
// main.carbon

library "Main";

import Cpp library "hello_world.h";

fn Run() -> i32 {
  Cpp.some_namespace.hello_world();
  return 0;
}
```

```shell
$ clang -c hello_world.cpp
$ bazel-bin/toolchain/carbon compile main.carbon
$ bazel-bin/toolchain/carbon link hello_world.o main.o --output=demo
$ ./demo
Hello World!
```

Closes #5102

2025-03-15 20:41:48 +00:00

..

no_prelude

Add support for importing C++ namespaces (#5103)

2025-03-15 20:41:48 +00:00