[clang] [CIR] Add token.none and fix coro.end signature (PR #214125)

[via cfe-commits]

Andres-Salamanca wrote:

With respect to the CI failure, it's quite weird because on my local machine the output is in this order:

```llvm
%18 = cir.token.none
%19 = cir.const #false
%20 = cir.const #cir.ptr<null> : !cir.ptr<!void>
```

But in CI, the order is:

```llvm
%20 = cir.const #cir.ptr<null> : !cir.ptr<!void>
%19 = cir.const #false
%18 = cir.token.none
```

So that's why it was failing. I think something is probably cached incorrectly in my build, so I committed the change that makes CI pass, but now it is failing locally.


https://github.com/llvm/llvm-project/pull/214125