[clang] [CIR] Implement FlattenCFG for coroutine AwaitOp, CoroBodyOp, and CoReturnOp (PR #203802)

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+// RUN: cir-opt %s -cir-flatten-cfg -o - | FileCheck %s \
+// RUN:   --implicit-check-not=cir.coroutine --implicit-check-not=cir.await \
+// RUN:   --implicit-check-not=cir.co_return --implicit-check-not=cir.coro.exit \
+// RUN:   --implicit-check-not=cir.coro.suspend_point
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Andres-Salamanca wrote:

Done. I also added it to the `coro-task` test.

https://github.com/llvm/llvm-project/pull/203802