[CIR] Upstream support for coroutine handling

[andykaylor]

Overview

Upstream support for handling C++ coroutines in ClangIR.

The incubator support for coroutines is at least partially incomplete (BI__builtin_coro_id is not handled). This may require some new development for full coroutine support.

Existing incubator tests

clang/test/CIR/CodeGen/coro-task.cpp

[Andres-Salamanca]

Hi @andykaylor, I would like to work on this. Can I assign it to myself?

[andykaylor]

@Andres-Salamanca I haven't looked to see if this has any significant dependencies on other missing code. Feel free to dig into it, and if it looks like it is ready to be upstreamed, go ahead and assign it to yourself.

[Andres-Salamanca]

I ran the test and encountered the following error:

error: ClangIR code gen Not Yet Implemented: emitStmt: CoroutineBodyStmt

At this point, nothing else seems to be failing. I’ll start working on this, and if additional issues come up, I’ll address them as well.

[Andres-Salamanca]

• [CIR] Initial support for emitting coroutine body #161616
• [CIR] Emit CIR builtins: coroAlloc, coroBegin, and coroSize #164180