[clang] [CIR] Initial support for emitting coroutine body (PR #161616)

[via cfe-commits]

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@@ -2341,6 +2341,12 @@ def CIR_FuncOp : CIR_Op<"func", [
     The function linkage information is specified by `linkage`, as defined by
     `GlobalLinkageKind` attribute.
 
+    A compiler builtin function must be marked as `builtin` for further
+    processing when lowering from CIR.
+
+    The `coroutine` keyword is used to mark coroutine function, which requires
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Andres-Salamanca wrote:

Done

https://github.com/llvm/llvm-project/pull/161616