[clang] [coroutines] Introduce [[clang::coro_lifetimebound]] (PR #72851)

[Chuanqi Xu via cfe-commits]

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@@ -7580,10 +7580,15 @@ static void visitLifetimeBoundArguments(IndirectLocalPath &Path, Expr *Call,
   if (ObjectArg && implicitObjectParamIsLifetimeBound(Callee))
     VisitLifetimeBoundArg(Callee, ObjectArg);
 
+  bool checkCoroCall = false;
+  if (const auto *RD = Callee->getReturnType()->getAsRecordDecl()) {
+    checkCoroCall |= RD->hasAttr<CoroLifetimeBoundAttr>() &&
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ChuanqiXu9 wrote:

```suggestion
    checkCoroCall = RD->hasAttr<CoroLifetimeBoundAttr>() &&
```

nit:

https://github.com/llvm/llvm-project/pull/72851