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

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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You can test this locally with the following command:
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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- clang/include/clang/CIR/MissingFeatures.h clang/lib/CIR/CodeGen/CIRGenCoroutine.cpp clang/lib/CIR/Dialect/IR/CIRDialect.cpp clang/lib/CIR/Dialect/Transforms/FlattenCFG.cpp clang/test/CIR/CodeGenCoroutines/coro-task.cpp --diff_from_common_commit
``````````

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The reproduction instructions above might return results for more than one PR
in a stack if you are using a stacked PR workflow. You can limit the results by
changing `origin/main` to the base branch/commit you want to compare against.
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/CIR/CodeGen/CIRGenCoroutine.cpp b/clang/lib/CIR/CodeGen/CIRGenCoroutine.cpp
index 207958717..c6e19c94f 100644
--- a/clang/lib/CIR/CodeGen/CIRGenCoroutine.cpp
+++ b/clang/lib/CIR/CodeGen/CIRGenCoroutine.cpp
@@ -566,7 +566,7 @@ CIRGenFunction::emitCoroutineBody(const CoroutineBodyStmt &s) {
 
     // Builds `exit`: coro.end(/*unwind*/ false) followed by the actual return
     // to the caller.
-    
+
     assert(!cir::MissingFeatures::coroutineGroManager());
     auto exitBuilder = [&]() {
       cir::ConstantOp nullHandler =

``````````

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